| Name | Nation | Sport | Games | Notes |
|---|
| Jorma Jaakola | Finland | Athletics | 1976 Summer | |
| Juho Jaakonaho | Road cycling | 1912 Summer | |
| Moussa Jaalouk | Lebanon | Alpine skiing | 1968 Winter | |
| Heikki Jaansalu | Estonia | Shooting | 1996 Summer | |
| Jüri Jaanson | Soviet Union, Estonia | Rowing | 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer, 2008 Summer | |
| Mieke Jaapies | Netherlands | Canoe sprint | 1968 Summer, 1972 Summer | |
| Christa Jaarsma | Speed skating | 1976 Winter | |
| Arto Jääskeläinen | Finland | Biathlon | 1984 Winter, 1988 Winter | |
| Oula Jääskeläinen | Figure skating | 1992 Winter | |
| Sulo Jääskeläinen | Nordic combined, Ski jumping | 1924 Winter | |
| Faïcel Jaballah | Tunisia | Judo | 2012 Summer, 2016 Summer | |
| Sabri Jaballah | Football | 1996 Summer | |
| Mohammed Qassim Jabbar | Iraq | Wrestling | 1980 Summer | |
| Mudhafar Jabbar | Football | 1988 Summer | |
| Sadie Jabbar | Boxing | 1980 Summer | |
| Ali Jabbari | Iran | Football | 1972 Summer | |
| Hossein Jabbarzadegan | Basketball | 1948 Summer | |
| Bassam El-Jabbin | Syria | Judo | 1980 Summer | |
| Tursunoy Jabborova | Uzbekistan | Weightlifting | 2024 Summer | |
| Ahmed Jumah Jaber | Qatar | Athletics | 2004 Summer | |
| Ons Jabeur | Tunisia | Tennis | 2012 Summer, 2016 Summer, 2020 Summer | |
| Soso Jabidze | Georgia | Wrestling | 2012 Summer | |
| Sebastián Jabif | Argentina | Volleyball | 1996 Summer | |
| Muna Jabir Adam | Sudan | Athletics | 2008 Summer | |
| M. P. Jabir | India | 2020 Summer | |
| Malik Jabir | Ghana | Football | 1968 Summer, 1972 Summer | |
| Piotr Jabłkowski | Poland | Fencing | 1980 Summer | |
| Gideon Jablonka | Israel | Athletics | 2000 Summer | |
| Leszek Jabłonowski | Poland | Fencing | 1976 Summer, 1980 Summer | |
| Dariusz Jabłoński | Wrestling | 1996 Summer, 2000 Summer, 2004 Summer | |
| Grzegorz Jabłoński | Boxing | 1988 Summer | |
| Piotr Jabłoński | Wrestling | 1996 Summer | |
| Tomasz Jabłoński | Boxing | 2016 Summer | |
| Sandra Jablonskytė | Lithuania | Judo | 2020 Summer | |
| Josef Jabor | Czechoslovakia | Rowing | 1936 Summer | |
| Jawdat Jabra | Syria | Wrestling | 1980 Summer | |
| Mihran Jaburyan | Armenia | 2012 Summer | |
| Marius Jaccard | Switzerland | Ice hockey | 1920 Summer, 1924 Winter | |
| Lyn Jacenko | Australia | Athletics | 1972 Summer | |
| Mateusz Jachlewski | Poland | Handball | 2008 Summer, 2016 Summer | |
| Leszek Jachna | Ice hockey | 1980 Winter, 1984 Winter, 1988 Winter | |
| Andrew Jachno | Australia | Athletics | 1984 Summer, 1988 Summer, 1992 Summer | |
| Micaela Martins Jacintho | Brazil | Basketball | 2008 Summer | |
| Juan Jacinto | Dominican Republic | Judo | 2000 Summer, 2004 Summer, 2008 Summer | |
| Archibald Jack | Great Britain | Modern pentathlon | 1936 Summer | |
| Badou Jack | The Gambia | Boxing | 2008 Summer | |
| Caroline Jack | South Africa | Field hockey | 2004 Summer | |
| Elizabeth Jack | Australia | Diving | 1976 Summer | |
| Fritz Jack | Germany | Fencing | 1908 Summer, 1912 Summer, 1928 Summer | |
| Hugh Jack | Australia | Athletics | 1956 Summer | |
| Laurence Jack | Vanuatu | 1996 Summer | |
| Nawal El Jack | Sudan | 2008 Summer | |
| Shayna Jack | Australia | Swimming | 2024 Summer | |
| Thomas Jack | Great Britain | Athletics | 1908 Summer | |
| William Jack | 1952 Summer | |
| Michael Jackel | Germany | Basketball | 1992 Summer | |
| Art Jackes | Canada | Athletics | 1948 Summer | |
| John Jackett | Great Britain | Rugby | 1908 Summer | |
| Richard Jackett | 1908 Summer | |
| Aleksandrs Jackēvičs | Soviet Union | Judo | 1980 Summer | |
| Vivien Jackl | Hungary | Swimming | 2024 Summer | |
| Philip Jacklin | Great Britain | Cross country skiing | 1980 Winter | |
| Barry Kirk Jackman | Barbados | Judo | 2004 Summer | |
| Lois Jackman | Australia | Athletics | 1956 Summer | |
| Danijela Jackovich | Water polo | 2024 Summer | |
| Brian Jacks | Great Britain | Judo | 1964 Summer, 1972 Summer, 1976 Summer | |
| Ron Jacks | Canada | Swimming | 1964 Summer, 1968 Summer, 1972 Summer | |
| Abeiku Jackson | Ghana | 2016 Summer, 2020 Summer | |
| Alan Jackson | Great Britain | Road cycling | 1956 Summer | |
| Alexandra Jackson | Swimming | 1968 Summer | |
| Alfred Jackson | Boxing | 1928 Summer | |
| Alison Jackson | Canada | Road cycling | 2020 Summer, 2024 Summer | |
| Arnold Jackson | Great Britain | Athletics | 1912 Summer | |
| Arthur Jackson | United States | Shooting | 1948 Summer, 1952 Summer, 1956 Summer | |
| Arthur Jackson | Great Britain | 1908 Summer | |
| Ashley Jackson | Field hockey | 2008 Summer, 2012 Summer, 2016 Summer | |
| Barry Jackson | Athletics | 1960 Summer | |
| Bershawn Jackson | United States | 2008 Summer | |
| Bill Jackson | Ireland | Basketball | 1948 Summer | |
| Bob Jackson | United States | Swimming | 1976 Summer | |
| Chase Jackson | Athletics | 2024 Summer | |
| Clinton Jackson | Boxing | 1976 Summer | |
| Colin Jackson | Great Britain | Athletics | 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer | |
| Craig Jackson | South Africa | Swimming | 1992 Summer | |
| Craig Jackson | Field hockey | 1996 Summer, 2004 Summer | |
| David Jackson | Uganda | Boxing | 1968 Summer, 1972 Summer | |
| David Jackson | New Zealand | 1976 Summer | |
| David Jackson | United States | 2000 Summer | |
| Dempster Jackson | Rowing | 1952 Summer | |
| Donald Jackson | Canada | Figure skating | 1960 Winter | |
| Donald Jackson | Archery | 1972 Summer | |
| Edwin Jackson | United States | Baseball | 2020 Summer | |
| Emma Jackson | Australia | Triathlon | 2012 Summer | |
| Eric Jackson | United States | Canoe slalom | 1992 Summer | |
| Erin Jackson | Speed skating | 2018 Winter, 2022 Winter | |
| Francia Jackson | Dominican Republic | Volleyball | 2004 Summer | |
| Grace Jackson | Jamaica | Athletics | 1984 Summer, 1988 Summer, 1992 Summer | |
| Harry Jackson | Great Britain | Track cycling | 1964 Summer, 1968 Summer | |
| Henry Jackson | Jamaica | Athletics | 1972 Summer | |
| James Jackson | Canada | Road cycling | 1932 Summer | |
| Jeff Jackson | Virgin Islands | Athletics | 2000 Summer | |
| Jennifer Jackson | Canada | Speed skating | 1972 Winter | |
| Jimmy Jackson | United States | Wrestling | 1976 Summer | |
| Joanna Jackson | Great Britain | Equestrian dressage | 1996 Summer | |
| Joanne Jackson | Swimming | 2004 Summer, 2008 Summer, 2012 Summer | |
| Johanna Jackson | Athletics | 2008 Summer, 2012 Summer | |
| John Jackson | United States | Shooting | 1912 Summer | |
| John Jackson | Great Britain | Athletics | 1968 Summer | |
| John Jackson | Virgin Islands | Boxing | 2008 Summer | |
| John Jackson | Ireland | Field hockey | 2016 Summer | |
| John James Jackson | Great Britain | Bobsleigh | 2010 Winter, 2014 Winter | |
| Joseph Jackson | United States | Shooting | 1920 Summer | |
| Joseph Jackson | France | Athletics | 1924 Summer, 1928 Summer | |
| Neil Jackson | Great Britain | Swimming | 1968 Summer | |
| Julius Jackson | Virgin Islands | Boxing | 2008 Summer | |
| Kevin Jackson | United States | Wrestling | 1992 Summer | |
| Lauren Jackson | Australia | Basketball | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer, 2024 Summer | |
| Laurence Jackson | Great Britain | Curling | 1924 Winter | |
| Lawrence Jackson | New Zealand | Rowing | 1932 Summer | |
| Lee-Steve Jackson | Great Britain | Biathlon | 2010 Winter, 2014 Winter | |
| Linda Jackson | Canada | Road cycling | 1996 Summer | |
| Lucious Jackson | United States | Basketball | 1964 Summer | |
| Luke Jackson | Australia | Boxing | 2012 Summer | |
| Mark Jackson | Canada | Athletics | 1992 Summer | |
| Mark Jackson | New Zealand | Short track speed skating | 2002 Winter | |
| Nell Jackson | United States | Athletics | 1948 Summer | |
| Nicola Jackson | Great Britain | Swimming | 2000 Summer | |
| Paula Jackson | Bobsleigh | 2010 Winter, 2014 Winter | |
| Peter Jackson | Virgin Islands | Sailing | 1972 Summer | |
| Peter Jackson | New Zealand | Table tennis | 1988 Summer, 1992 Summer, 2000 Summer | |
| Peter H. Jackson | Great Britain | Rowing | 1936 Summer | |
| Roger Jackson | Canada | 1964 Summer, 1968 Summer, 1972 Summer | |
| Shericka Jackson | Jamaica | Athletics | 2016 Summer, 2020 Summer | |
| Stephen Jackson | Great Britain | Canoe sprint | 1984 Summer | |
| Susan Jackson | Figure skating | 1984 Winter | |
| Sylvia Jackson | Canoe sprint | 1968 Summer | |
| T. J. Jackson | United States | Athletics | 1964 Summer | |
| Tammy Jackson | Basketball | 1992 Summer | |
| Thomas Jackson | Athletics | 1908 Summer | |
| Tim Jackson | Australia | 1996 Summer | |
| Trina Jackson | United States | Swimming | 1996 Summer | |
| William Jackson | Great Britain | Curling | 1924 Winter | |
| Wilton Jackson | Trinidad and Tobago | Athletics | 1964 Summer | |
| Marjorie Jackson-Nelson | Australia | 1952 Summer | |
| Amoj Jacob | India | 2020 Summer, 2024 Summer | |
| Anthony Jacob | Canada | Rowing | 2012 Summer | |
| Antoine Jacob | France | Diving | 1924 Summer | |
| Bryan Jacob | United States | Weightlifting | 1992 Summer, 1996 Summer | |
| Christine Jacob | Philippines | Swimming | 1984 Summer | |
| Cornelia Jacob | East Germany | Speed skating | 1980 Winter | |
| Domien Jacob | Belgium | Artistic gymnastics | 1920 Summer | |
| Doris Jacob | Nigeria | Athletics | 2000 Summer | |
| Edwin Jacob | Great Britain | Sailing | 1924 Summer | |
| Heilwig Jacob | Germany | Athletics | 1964 Summer | |
| Isaac Jacob | Nigeria | Wrestling | 1996 Summer | |
| Ivan Jacob | India | Athletics | 1952 Summer | |
| Klaus Jacob | East Germany | Rowing | 1968 Summer | |
| Lisa Jacob | United States | Swimming | 1996 Summer | |
| Luis Jacob | Peru | Basketball | 1936 Summer | |
| Matthias Jacob | East Germany | Biathlon | 1984 Winter, 1988 Winter | |
| Rainer Jacob | West Germany | Swimming | 1972 Summer | |
| Steffi Jacob | Germany | Skeleton | 2002 Winter | |
| Sydney Jacob | India | Tennis | 1924 Summer | |
| Thomas Jacob | East Germany | Luge | 1988 Winter | |
| Trevor Jacob | United States | Snowboarding | 2014 Winter | |
| Aharon Jacobashvili | Israel | Boxing | 1988 Summer | |
| Lindsey Jacobellis | United States | Snowboarding | 2006 Winter, 2010 Winter, 2014 Winter, 2018 Winter, 2022 Winter | |
| Hans-Jürgen Jacobi | East Germany | Athletics | 1980 Summer | |
| Joe Jacobi | United States | Canoe slalom | 1992 Summer, 2004 Summer | |
| Lothar Jacobi | Germany | Shooting | 1964 Summer | |
| Nicolas Jacobi | Field hockey | 2016 Summer | |
| Antônio Jacobina Filho | Brazil | Water polo | 1932 Summer | |
| Alfredo Jacobo | Mexico | Swimming | 2000 Summer | |
| Akira Jacobs | Japan | Basketball | 2024 Summer | |
| Bert Jacobs | Australia | Equestrian jumping | 1956 Summer | |
| Brad Jacobs | Canada | Curling | 2014 Winter | |
| Bruce Jacobs | South Africa | Field hockey | 2004 Summer, 2008 Summer | |
| Chris Jacobs | United States | Swimming | 1988 Summer | |
| Clare Jacobs | Athletics | 1908 Summer | |
| Cuthbert Jacobs | Antigua and Barbuda | 1976 Summer | |
| Danie Jacobs | South Africa | 1928 Summer | |
| David Jacobs | Great Britain | 1912 Summer | |
| Eugène Jacobs | Belgium | Rowing | 1952 Summer | |
| George Jacobs [ Wikidata ] | United States | Art competitions | 1932 Summer | |
| Harry Jacobs | Tug of war | 1904 Summer | |
| Jacklord Jacobs | Nigeria | Boxing | 1992 Summer | |
| Lodewijk Jacobs | Netherlands | Canoe sprint | 1976 Summer | |
| Marcell Jacobs | Italy | Athletics | 2020 Summer, 2024 Summer | |
| Mozes Jacobs | Netherlands | Artistic gymnastics | 1928 Summer | |
| Nico Jacobs | Namibia | Wrestling | 2004 Summer | |
| Peter Jacobs | Great Britain | Fencing | 1964 Summer, 1968 Summer | |
| Regina Jacobs | United States | Athletics | 1988 Summer, 1992 Summer, 1996 Summer | |
| Simmone Jacobs | Great Britain | 1984 Summer, 1988 Summer, 1992 Summer, 1996 Summer | |
| Thomas M. Jacobs | United States | Cross country skiing, Nordic combined | 1952 Winter | |
| Alf Jacobsen | Norway | Sailing | 1920 Summer | |
| Allan Jacobsen | Denmark | Road cycling | 1980 Summer | |
| Anders Jacobsen | Norway | Ski jumping | 2010 Winter, 2014 Winter | |
| Arne Jacobsen | Denmark | Archery | 1972 Summer, 1976 Summer | |
| Else Jacobsen | Swimming | 1928 Summer, 1932 Summer | |
| Hans Jacobsen | Shooting | 1924 Summer | |
| Helge Jacobsen | Track cycling | 1936 Summer | |
| Ida Jacobsen | Rowing | 2020 Summer | |
| Jan Jacobsen | Archery | 1988 Summer | |
| Johannes Jacobsen | Wrestling | 1928 Summer | |
| Knud Jacobsen | Road cycling | 1936 Summer | |
| Marit Røsberg Jacobsen | Norway | Handball | 2020 Summer, 2024 Summer | |
| Mette Jacobsen | Denmark | Swimming | 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer | |
| Olof Jacobsen | Norway | Artistic gymnastics | 1912 Summer | |
| Rolf Jacobsen | Boxing | 1920 Summer | |
| Rune Jacobsen | Sailing | 1992 Summer | |
| Sabina Jacobsen | Sweden | Handball | 2016 Summer | |
| Svend Jacobsen | Denmark | Fencing | 1936 Summer | |
| Thomas Jacobsen | Sailing | 2000 Summer | |
| Uwe Jacobsen | Germany | Swimming | 1960 Summer, 1964 Summer | |
| Henrik Jacobsgaard | Denmark | Handball | 1976 Summer | |
| Helen Jacobsohn | Australia | Canoe sprint | 1976 Summer | |
| Emily Jacobson | United States | Fencing | 2004 Summer | |
| Gunnar Jacobson | Sweden | Modern pentathlon | 1976 Summer | |
| Hans Jacobson | Modern pentathlon, Fencing | 1968 Summer, 1976 Summer, 1980 Summer | |
| Payton Jacobson [ Wikidata ] | United States | Wrestling | 2024 Summer | |
| Sada Jacobson | Fencing | 2004 Summer, 2008 Summer | |
| Boris Jacobsson | Sweden | Sailing | 1964 Summer | |
| Gunilla Jacobsson | Speed skating | 1964 Winter | |
| Kjell Jacobsson | Shooting | 1972 Summer, 1976 Summer | |
| Margareta Jacobsson | Alpine skiing | 1952 Winter | |
| Marie Jacobsson | Artistic swimming | 1988 Summer | |
| Nils Jacobsson | Weightlifting | 1952 Summer | |
| Sigfrid Jacobsson | Athletics | 1912 Summer | |
| Skotte Jacobsson | 1912 Summer | |
| Stefan Jacobsson | Weightlifting | 1976 Summer | |
| Pieter Jacobszoon | Netherlands | Swimming | 1924 Summer | |
| Charles Jacobus | United States | Roque | 1904 Summer | |
| Dirk Jacoby | West Germany | Water polo | 1988 Summer | |
| Jean Jacoby | Luxembourg | Art competitions | 1924 Summer, 1928 Summer, 1932 Summer, 1936 Summer | |
| Lydia Jacoby | United States | Swimming | 2020 Summer | |
| Maria Jacoby | Luxembourg | Art competitions | 1936 Summer | |
| Mike Jacoby | United States | Snowboarding | 1998 Winter | |
| Roland Jacoby | Luxembourg | Shooting | 1980 Summer, 1984 Summer, 1988 Summer | |
| Antía Jácome | Spain | Canoe sprint | 2020 Summer, 2024 Summer | |
| Fernando Jácome | Colombia | Swimming | 2000 Summer | |
| Virgil Jacomini | United States | Rowing | 1920 Summer | |
| Alfred Jacomis | France | Cross country skiing | 1936 Winter | |
| Nestor Jacono | Malta | Athletics | 1948 Summer | |
| Francis Jacot | Switzerland | Cross country skiing | 1980 Winter | |
| Michèle Jacot | France | Alpine skiing | 1972 Winter, 1976 Winter | |
| Thierry Jacot | Switzerland | Swimming | 1984 Summer | |
| Alexandre Jacovleff | Russia | Art competitions | 1924 Summer | |
| Maurice Jacquel | France | Wrestling | 1960 Summer | |
| Émilien Jacquelin | Biathlon | 2018 Winter, 2022 Winter | |
| Jacquemin [ Wikidata ] | Artistic gymnastics | 1900 Summer | |
| Victor Jacquemin | Belgium | Athletics | 1908 Summer | |
| Ingrid Jacquemod | France | Alpine skiing | 2002 Winter, 2006 Winter, 2010 Winter | |
| Catherine Jacques | Belgium | Judo | 2004 Summer, 2008 Summer | |
| Donald Jacques | United States | Bobsleigh | 1956 Winter | |
| Farah Jacques | Canada | Athletics | 2016 Summer | |
| Melinda Jacques | France | Handball | 2004 Summer | |
| Michael Jacques | United States | Weightlifting | 1988 Summer | |
| Viviane Jacques | Brazil | Handball | 2000 Summer, 2004 Summer, 2008 Summer | |
| Joséphine Jacques-André-Coquin | France | Fencing | 2016 Summer | |
| Lina Jacques-Sébastien | Athletics | 2008 Summer, 2012 Summer | |
| Gérard Jacquesson | Rowing | 1964 Summer | |
| Simone Jacquet Thrysøe | Denmark | Ice hockey | 2022 Winter | |
| Chloé Jacquet | France | Rugby sevens | 2020 Summer, 2024 Summer | |
| Ernest Jacquet | Switzerland | Ice hockey | 1924 Winter | |
| Henri Jacquet | Fencing | 1920 Summer, 1924 Summer, 1928 Summer | |
| Marie Jacquet | France | Rowing | 2020 Summer | |
| Olivier Jacquet | Switzerland | Fencing | 1992 Summer, 1996 Summer | |
| Robert Jacquet | France | Rowing | 1936 Summer | |
| Lisa Ann Jacquin | United States | Equestrian jumping | 1988 Summer, 1992 Summer | |
| Paul Jacquot | Switzerland | Rowing | 2020 Summer | |
| József Jacsó | Hungary | Weightlifting | 1988 Summer | |
| Lenke Jacsó-Kiss | Basketball | 1980 Summer | |
| Lucien Jactel [ Wikidata ] | France | Fencing | 1900 Summer | |
| Stavre Jada | North Macedonia | Cross country skiing | 2018 Winter, 2022 Winter | |
| Ali Saleh Al-Jadani | Saudi Arabia | Athletics | 2000 Summer | |
| Stig Jäder | Sweden | Cross country skiing | 1980 Winter | |
| K. D. Jadhav | India | Wrestling | 1948 Summer, 1952 Summer | |
| Pravin Jadhav | Archery | 2020 Summer, 2024 Summer | |
| Shrirang Jadhav | Wrestling | 1952 Summer | |
| Nordin Mohamed Jadi | Malaysia | Athletics | 1984 Summer, 1988 Summer | |
| Abbas Jadidi | Iran | Wrestling | 1996 Summer, 2000 Summer | |
| Alfredo Jadresic | Chile | Athletics | 1948 Summer | |
| Soraya Jadué | Rowing | 2000 Summer, 2004 Summer, 2008 Summer | |
| Cornelius Jadwin | United States | Equestrian jumping | 1936 Summer | |
| Tracy Jaeckel | Fencing | 1932 Summer, 1936 Summer | |
| Willy Jaeckel | Germany | Art competitions | 1928 Summer, 1932 Summer | |
| Jaegal Sung-yeol | South Korea | Speed skating | 1992 Winter, 1994 Winter, 1998 Winter | |
| Connor Jaeger | United States | Swimming | 2012 Summer, 2016 Summer | |
| Kaj Jægergaard | Denmark | Wrestling | 1980 Summer | |
| Yi Jaegyeong [ Wikidata ] | South Korea | Diving | 2024 Summer | |
| Back Jae-ho [ Wikidata ] | Baseball | 1996 Summer | |
| Im Jae-ho | North Korea | Weightlifting | 1976 Summer | |
| Rafael Jaén | Spain | Football | 1968 Summer | |
| Gustav Jaenecke | Germany | Ice hockey | 1928 Winter, 1932 Winter, 1936 Winter | |
| Chelsea Jaensch | Australia | Athletics | 2016 Summer | |
| Martin Jære | Norway | Cross country skiing | 1948 Winter | |
| Thomas Jaeschke | United States | Volleyball | 2016 Summer, 2020 Summer, 2024 Summer | |
| An Jae-Won [ Wikidata ] | South Korea | Wrestling | 1972 Summer | |
| Kim Jae-won [ Wikidata ] | Fencing | 2024 Summer | |
| Habib Jafar | Iraq | Football | 1988 Summer | |
| Kamil Jafari | Iran | Shooting | 1976 Summer | |
| Emin Jafarov | Azerbaijan | 2020 Summer | |
| Galib Jafarov | Kazakhstan | Boxing | 2004 Summer, 2008 Summer | |
| Hasrat Jafarov | Azerbaijan | Wrestling | 2024 Summer | |
| Sayed Jaffar | India | Field hockey | 1932 Summer, 1936 Summer | |
| Peter Jaffe | Great Britain | Sailing | 1932 Summer | |
| Scott Jaffe | United States | Swimming | 1992 Summer | |
| Irving Jaffee | Speed skating | 1928 Winter, 1932 Winter | |
| Ali Mohamed Jaffer | South Yemen | Boxing | 1988 Summer | |
| Martial Jaffredo | France | Figure skating | 1998 Winter | |
| Abdel Fattah Jafri | Morocco | Football | 1972 Summer | |
| Ulla Jäfvert | Sweden | Swimming | 1964 Summer | |
| Anna Jagaciak-Michalska | Poland | Athletics | 2016 Summer | |
| Goran Jagar | Serbia | Rowing | 2008 Summer, 2012 Summer | |
| Ronnie Jagday | Canada | Field hockey | 2000 Summer | |
| Juozas Jagelavičius | Soviet Union | Rowing | 1964 Summer, 1968 Summer | |
| Hans Jagenburg | Sweden | Athletics | 1920 Summer | |
| Adolf Jäger | Germany | Football | 1912 Summer | |
| Bernd Jäger | East Germany | Artistic gymnastics | 1976 Summer | |
| Evan Jager | United States | Athletics | 2012 Summer, 2016 Summer | |
| Herbert Jäger | Germany | Football | 1952 Summer | |
| Karin Jäger | West Germany | Cross country skiing | 1980 Winter, 1984 Winter, 1988 Winter | |
| Klaus Jäger | Rowing | 1976 Summer | |
| Luke Jager | United States | Cross country skiing | 2022 Winter | |
| Maja Jager | Denmark | Archery | 2012 Summer, 2020 Summer | |
| Mirjam Jäger | Switzerland | Freestyle skiing | 2014 Winter | |
| Regina Jäger | East Germany | Swimming | 1976 Summer | |
| Stephan Jäger | Germany | Golf | 2024 Summer | |
| Tom Jager | United States | Swimming | 1984 Summer, 1988 Summer, 1992 Summer | |
| Werner Jäger | Austria | Speed skating | 1984 Winter | |
| Nicole Jagerman | Netherlands | Tennis | 1992 Summer | |
| Reginald Jagers III | United States | Athletics | 2020 Summer | |
| Finn Christian Jagge | Norway | Alpine skiing | 1988 Winter, 1992 Winter, 1994 Winter, 1998 Winter | |
| Liv Jagge-Christiansen | 1960 Winter, 1964 Winter | |
| Amy Jagger | Great Britain | Artistic gymnastics | 1928 Summer | |
| Louis Jäggi | Switzerland | Cross country skiing | 1972 Winter | |
| Willy Jäggi | Football | 1928 Summer | |
| Jan Jagla | Germany | Basketball | 2008 Summer | |
| Milan Jagnešák | Slovakia | Bobsleigh | 2002 Winter, 2006 Winter, 2010 Winter, 2014 Winter | |
| Derek Jago | Ireland | Sailing | 1976 Summer | |
| Matthew Jago | South Africa | Judo | 2008 Summer | |
| Mauro Jagodnich | Italy | Rowing | 1988 Summer | |
| Henryk Jagodziński | Poland | 1952 Summer, 1956 Summer | |
| Jaak-Heinrich Jagor | Estonia | Athletics | 2016 Summer | |
| Jaromír Jágr | Czech Republic | Ice hockey | 1998 Winter, 2002 Winter, 2006 Winter, 2010 Winter, 2014 Winter | |
| Pauline Jagsch | Germany | Canoe sprint | 2024 Summer | |
| Arijana Jaha | Bosnia and Herzegovina | Judo | 2000 Summer | |
| Tofigh Jahanbakht | Iran | Wrestling | 1952 Summer | |
| Majid Jahandideh | 1992 Summer | |
| Ghafour Jahani | Football | 1976 Summer | |
| Danial Jahić | Serbia and Montenegro | Athletics | 2000 Summer | |
| Evelin Jahl | East Germany | 1976 Summer, 1980 Summer | |
| Marlene Jahl | Austria | Taekwondo | 2024 Summer | |
| Bettine Jahn | East Germany | Athletics | 1980 Summer | |
| Hans-Gert Jahn | Biathlon | 1968 Winter | |
| Joel Jahn | Finland | Sailing | 1956 Summer | |
| Lisa Jahn | Germany | Canoe sprint | 2020 Summer, 2024 Summer | |
| Ludwig Jahn | East Germany | Bobsleigh | 1988 Winter | |
| Marianne Jahn | Austria | Alpine skiing | 1960 Winter, 1964 Winter | |
| Sabine Jahn | East Germany | Rowing | 1976 Summer | |
| Willie Jahn | Germany | Athletics | 1912 Summer | |
| Barton Jahncke | United States | Sailing | 1968 Summer | |
| Anthony Jahnke [ Wikidata ] | Artistic gymnastics | 1904 Summer | |
| Hugo Jahnke | Sweden | 1908 Summer | |
| Sebastián Jahnsen Madico | Peru | Swimming | 2012 Summer | |
| Kai Jahnsson | Finland | Shooting | 2008 Summer, 2012 Summer | |
| Carl Jahnzon | Sweden | Athletics | 1912 Summer | |
| Libuše Jahodová | Czech Republic | Shooting | 2016 Summer | |
| John Jahr | Germany | Curling | 2014 Winter | |
| Line Jahr | Norway | Ski jumping | 2014 Winter | |
| Khaled Jahrami | Kuwait | Fencing | 1988 Summer | |
| Tuulikki Jahre | Sweden | Road cycling | 1984 Summer | |
| Anne Jahren | Norway | Cross country skiing | 1984 Winter, 1988 Winter | |
| Paul Jahren | Wrestling | 1924 Summer | |
| Harald Jährling | East Germany | Rowing | 1976 Summer, 1980 Summer | |
| Rob Jahrling | Australia | 1996 Summer, 2000 Summer, 2004 Summer | |
| Wilhelm Jaich | Austria | Equestrian dressage | 1928 Summer | |
| Thongchai Jaidee | Thailand | Golf | 2016 Summer | |
| Radhi Jaïdi | Tunisia | Football | 1996 Summer | |
| Jean Jaillard | France | Artistic gymnastics | 1960 Summer | |
| Mida Fah Jaiman [ Wikidata ] | Thailand | Alpine skiing | 2022 Winter | |
| Blanca Jaime | Mexico | Athletics | 1988 Summer | |
| Kamini Jain | Canada | Canoe sprint | 2000 Summer, 2004 Summer | |
| Odei Jainaga | Spain | Athletics | 2020 Summer | |
| Suchart Jairsuraparp | Thailand | 1976 Summer | |
| O. P. Jaisha | India | 2016 Summer | |
| Erwin Jaisli | Switzerland | Road cycling | 1960 Summer, 1964 Summer | |
| Phoi Jaiswang | Thailand | Athletics | 1956 Summer | |
| Martín Jaite | Argentina | Tennis | 1988 Summer | |
| Jairulla Jaitulla | Philippines | Swimming | 1972 Summer, 1984 Summer | |
| Damián Jajarabilla [ Wikidata ] | Argentina | Archery | 2024 Summer | |
| Kordian Jajszczok | Poland | Ice hockey | 1976 Winter | |
| Andrea Jakab | Romania | Speed skating | 2002 Winter | |
| János Jakab | Hungary | Table tennis | 2008 Summer | |
| József Jakab | Boxing | 1976 Summer | |
| Vilmos Jakab | 1976 Summer | |
| Sándor Jakabfy | Athletics | 1956 Summer | |
| László Jakabházy | Ice hockey | 1964 Winter | |
| Zsuzsanna Jakabos | Swimming | 2004 Summer, 2008 Summer, 2012 Summer, 2016 Summer, 2020 Summer | |
| Edy Jakariya | Indonesia | Athletics | 2004 Summer | |
| Nathan Jakavicius | Australia | Volleyball | 2000 Summer | |
| Assel Jakayeva | Kazakhstan | Water polo | 2000 Summer, 2004 Summer | |
| Bernd Jäkel | East Germany, Germany | Sailing | 1980 Summer, 1988 Summer, 1992 Summer, 1996 Summer | |
| Adolf Jakeš | Czechoslovakia | Shooting | 1980 Summer | |
| Norway Jackes | Canada | Rowing | 1908 Summer | |
| Joanna Jakimiuk | Poland | Fencing | 1996 Summer | |
| Egone Jakin [ Wikidata ] | Italy | Sailing | 1952 Summer | |
| Petr Jákl | Czechoslovakia | Judo | 1972 Summer | |
| Petr Jákl | Czech Republic | 2000 Summer | |
| Vilém Jakl | Czechoslovakia | Road cycling | 1936 Summer | |
| Hansjörg Jäkle | Germany | Ski jumping | 1994 Winter, 1998 Winter | |
| Sharon Jaklofsky | Netherlands | Athletics | 1996 Summer | |
| Hans Jakob | Germany | Football | 1936 Summer | |
| Maike Jakob [ Wikidata ] | Canoe sprint | 2024 Summer | |
| Patrick Jakob [ Wikidata ] | Austria | Biathlon | 2022 Winter | |
| Eugen Jakobčič | Yugoslavia | Fencing | 1936 Summer | |
| Gert Jakobs | Netherlands | Road cycling | 1984 Summer | |
| Marco Jakobs | Germany | Bobsleigh | 1998 Winter | |
| Jakobína Jakobsdóttir | Iceland | Alpine skiing | 1956 Winter | |
| Christian Jakobsen | Denmark | Badminton | 1996 Summer | |
| Emil Jakobsen | Handball | 2020 Summer, 2024 Summer | |
| Hans Jakobsen | Artistic gymnastics | 1920 Summer | |
| Henning Lynge Jakobsen | Canoe sprint | 1984 Summer | |
| Ivar Jakobsen | Track cycling | 1976 Summer | |
| Josefine Jakobsen | Ice hockey | 2022 Winter | |
| Julian Jakobsen | 2022 Winter | |
| Kristoffer Jakobsen | Sweden | Alpine skiing | 2018 Winter, 2022 Winter | |
| Lisbet Jakobsen | Denmark | Rowing | 2016 Summer | |
| Tommy Jakobsen | Norway | Ice hockey | 1992 Winter, 1994 Winter, 2010 Winter | |
| Åsa Jakobsson | Sweden | Football | 1996 Summer | |
| Daníel Jakobsson | Iceland | Cross country skiing | 1994 Winter | |
| Evert Jakobsson | Finland | Athletics | 1908 Summer | |
| Jarl Jakobsson | 1908 Summer | |
| Johan Jakobsson | Sweden | Handball | 2012 Summer, 2016 Summer | |
| Ludowika Jakobsson | Finland | Figure skating | 1920 Summer, 1924 Winter, 1928 Winter | |
| Menotti Jakobsson | Sweden | Nordic combined, Ski jumping | 1924 Winter | |
| Óskar Jakobsson | Iceland | Athletics | 1976 Summer, 1980 Summer | |
| Sofia Jakobsson | Sweden | Football | 2012 Summer, 2016 Summer, 2020 Summer | |
| Steinþór Jakobsson | Iceland | Alpine skiing | 1956 Winter | |
| Sverre Andreas Jakobsson | Handball | 2008 Summer, 2012 Summer | |
| Torsten Jakobsson [ Wikidata ] | Sweden | Alpine skiing | 1976 Winter, 1980 Winter | |
| Walter Jakobsson | Finland | Figure skating | 1920 Summer, 1924 Winter, 1928 Winter | |
| Albin Jakopič | Yugoslavia | Nordic combined, Ski jumping | 1936 Winter | |
| Avgust Jakopič | Cross country skiing | 1936 Winter | |
| Blaž Jakopič | Alpine skiing | 1968 Winter | |
| Bogdan Jakopič | Ice hockey | 1976 Winter | |
| Michael Jakosits | Germany | Shooting | 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer | |
| Tibor Jakosits | Hungary | 1964 Summer | |
| Jiří Jakoubek | Czechoslovakia | Rowing | 1988 Summer | |
| Franjo Jakovac | Yugoslavia | Biathlon | 1984 Winter | |
| Anatoly Jakovlev [ Wikidata ] | Russia | Fencing | 1912 Summer | |
| Alla Jakovleva | Soviet Union | Road cycling | 1988 Summer | |
| Artūrs Jakovļevs | Latvia | Swimming | 1992 Summer, 1996 Summer, 2000 Summer | |
| Dragoslav Jakovljević | Yugoslavia | Boxing | 1960 Summer | |
| Jānis Jaks | Latvia | Ice hockey | 2022 Winter | |
| Martin Jakš | Czech Republic | Cross country skiing | 2010 Winter, 2014 Winter, 2018 Winter | |
| Peter Jaks | Switzerland | Ice hockey | 1988 Winter, 1992 Winter | |
| Hans Jaksch | Austria | Art competitions | 1948 Summer | |
| Malte Jakschik | Germany | Rowing | 2016 Summer, 2020 Summer | |
| Nikola Jakšić | Serbia | Water polo | 2016 Summer, 2020 Summer, 2024 Summer | |
| Petar Jakšić | 2024 Summer | |
| Hans-Peter Jakst | West Germany | Road cycling | 1976 Summer | |
| Jaroslavas Jakšto | Lithuania | Boxing | 2004 Summer, 2008 Summer | |
| Phatsorn Jaksuninkorn | Thailand | Athletics | 2008 Summer | |
| Indrė Jakubaitytė | Lithuania | 2012 Summer | |
| Anna Jakubczak | Poland | 2000 Summer, 2004 Summer, 2008 Summer | |
| Lucas Jakubczyk | Germany | 2012 Summer, 2016 Summer | |
| Paweł Jakubiak | Poland | Field hockey | 2000 Summer | |
| Tomasz Jakubiak | Sailing | 2000 Summer, 2004 Summer | |
| Krystyna Jakubowska | Volleyball | 1964 Summer, 1968 Summer | |
| Bernd Jakubowski | East Germany | Football | 1980 Summer | |
| Igor Jakubowski | Poland | Boxing | 2016 Summer | |
| Ivana Jakupčević | Croatia | Figure skating | 1998 Winter | |
| Güsemiin Jalaa | Mongolia | Judo | 1976 Summer, 1980 Summer | |
| Gilles Jalabert | France | Wrestling | 1984 Summer, 1988 Summer | |
| Laurent Jalabert | Road cycling | 1996 Summer, 2000 Summer | |
| Mohamed Al-Jalai | Yemen | Judo | 1992 Summer | |
| Jalal Khan | Pakistan | Athletics | 1952 Summer, 1956 Summer | |
| Ahmed Jalal | Bahrain | Handball | 2020 Summer | |
| Mohamed Shah Jalal [ Wikidata ] | Bangladesh | Athletics | 1988 Summer, 1992 Summer | |
| Philip Jalalpoor | Iran | Basketball | 2020 Summer | |
| Parviz Jalayer | Weightlifting | 1964 Summer, 1968 Summer | |
| Büjiin Jalbaa | Mongolia | Speed skating | 1968 Winter | |
| Grace Jale | New Zealand | Football | 2024 Summer | |
| Étienne Jalenques | France | Modern pentathlon | 1960 Summer | |
| Gazimagomed Jalidov | Spain | Boxing | 2020 Summer | |
| Kew Jaliens | Netherlands | Football | 2008 Summer | |
| Kalle Jalkanen | Finland | Cross country skiing | 1936 Winter | |
| Kauko Jalkanen | Fencing | 1948 Summer, 1952 Summer | |
| Tarmo Jallai | Estonia | Athletics | 2004 Summer | |
| Bunturabie Jalloh | Sierra Leone | Swimming | 2016 Summer | |
| Wael Jallouz | Tunisia | Handball | 2012 Summer, 2016 Summer | |
| Abdurahman Jallow | The Gambia | Athletics | 1984 Summer | |
| Dawda Jallow | 1984 Summer, 1988 Summer, 1992 Summer, 1996 Summer | |
| Mimosa Jallow | Finland | Swimming | 2016 Summer, 2020 Summer | |
| Sanu Jallow [ Wikidata ] | The Gambia | Athletics | 2024 Summer | |
| Amman Jalmaani | Philippines | Swimming | 1964 Summer, 1968 Summer, 1972 Summer | |
| Roberto Jalnaiz | Boxing | 1988 Summer, 1992 Summer | |
| Risto Jalo | Finland | Ice hockey | 1984 Winter | |
| Tomi Jalo | Football | 1980 Summer | |
| Marcin Jałocha | Poland | 1992 Summer | |
| Jasurbek Jaloliddinov | Uzbekistan | 2024 Summer | |
| Bakhodir Jalolov | Boxing | 2016 Summer, 2020 Summer, 2024 Summer | |
| Mira Jalosuo | Finland | Ice hockey | 2014 Winter, 2018 Winter | |
| Hanna Jaltner | Sweden | Swimming | 1996 Summer | |
| Sultan Waleed Jamaan | Qatar | Football | 1984 Summer | |
| Admir Jamak | Yugoslavia | Biathlon | 1992 Winter | |
| Aminat Yusuf Jamal | Bahrain | Athletics | 2020 Summer | |
| Maryam Yusuf Jamal | 2008 Summer, 2012 Summer | |
| Juni Karimah Noor Jamali | Malaysia | Sailing | 2020 Summer | |
| Kambozia Jamali | Iran | Football | 1964 Summer | |
| Nazzar Al-Jamali | Iraq | Athletics | 1960 Summer | |
| Yekta Jamali | Refugee Olympic Team | Weightlifting | 2024 Summer | |
| Mohaisen Al-Jam'an | Saudi Arabia | Football | 1984 Summer | |
| Mariama Jamanka | Germany | Bobsleigh | 2018 Winter, 2022 Winter | |
| Sainbayaryn Jambaljamts | Mongolia | Road cycling | 2024 Summer | |
| Binta Jambane | Mozambique | Athletics | 1984 Summer | |
| Jules Jambers [ Wikidata ] | Belgium | Art competitions | 1936 Summer | |
| Mahlagha Jambozorg | Iran | Shooting | 2012 Summer, 2016 Summer | |
| István Jambrik | Hungary | 2000 Summer | |
| Léa Jamelot | France | Canoe sprint | 2016 Summer, 2020 Summer | |
| Allen James | United States | Athletics | 1992 Summer, 1996 Summer | |
| Amanda James | Great Britain | Swimming | 1976 Summer | |
| Antony James | 2012 Summer | |
| Becky James | Track cycling | 2016 Summer | |
| Bob James | United States | Sailing | 1968 Summer | |
| Byron James | Guyana | Road cycling | 1988 Summer | |
| Ciaran James | Great Britain | Water polo | 2012 Summer | |
| David James | United States | Sailing | 1968 Summer | |
| Dorian James | South Africa | Badminton | 2004 Summer, 2012 Summer | |
| Grant James | United States | Rowing | 2012 Summer | |
| H. Evan James | Great Britain | Fencing | 1908 Summer, 1920 Summer | |
| Harold James | Archery | 1908 Summer | |
| Hilda James | Swimming | 1920 Summer | |
| Howard James | Rowing | 1948 Summer | |
| Ian James | Canada | Athletics | 1988 Summer, 1992 Summer | |
| Jack James [ Wikidata ] | Great Britain | Fencing | 1928 Summer | |
| John James | Rowing | 1964 Summer | |
| Kamara James | United States | Fencing | 2004 Summer | |
| Karen James | Canada | Swimming | 1972 Summer | |
| Karl James | Antigua and Barbuda | Sailing | 1996 Summer, 2000 Summer | |
| Keith James | South Africa | Athletics | 1960 Summer | |
| Kelli James | United States | Field hockey | 1996 Summer | |
| Ken James | Australia | Basketball | 1972 Summer | |
| Kirani James | Grenada | Athletics | 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| Kirstie James | New Zealand | Track cycling | 2020 Summer | |
| Larry James | United States | Athletics | 1968 Summer | |
| LeBron James | Basketball | 2004 Summer, 2008 Summer, 2012 Summer, 2024 Summer | |
| Lee James | Weightlifting | 1976 Summer | |
| Lindsay James | Greece | Softball | 2004 Summer | |
| Mandy James | United States | Rhythmic gymnastics | 1996 Summer | |
| Marvin James | Switzerland | Snowboarding | 2014 Winter | |
| Mirja Jämes | Finland | Athletics | 1948 Summer | |
| Monday James | Nigeria | Football | 2008 Summer | |
| Moses James | Boxing | 1992 Summer | |
| Paul James | Canada | Football | 1984 Summer | |
| Renick James | Belize | Judo | 2016 Summer | |
| Romeo James | India | Field hockey | 1984 Summer | |
| Ross James | United States | Rowing | 2012 Summer | |
| Rudolph James | Guyana | Weightlifting | 1968 Summer | |
| Scotty James | Australia | Snowboarding | 2010 Winter, 2014 Winter, 2018 Winter, 2022 Winter | |
| Sherwin James | Dominica | Athletics | 2000 Summer | |
| Tjallie James | Netherlands | Rowing | 1928 Summer | |
| Tom James | Great Britain | 2004 Summer, 2008 Summer, 2012 Summer | |
| Trevor James | Trinidad and Tobago | Athletics | 1972 Summer | |
| Vanessa James | France, Canada | Figure skating | 2010 Winter, 2014 Winter, 2018 Winter, 2022 Winter | |
| Xavier James | Bermuda | Athletics | 2004 Summer | |
| Malik James-King | Jamaica | 2024 Summer | |
| Andy Jameson | Great Britain | Swimming | 1984 Summer, 1988 Summer | |
| Claude Jameson | United States | Football | 1904 Summer | |
| Geoffrey Jameson | Australia | Wrestling | 1956 Summer, 1960 Summer | |
| Helen Jameson | Great Britain | Swimming | 1980 Summer | |
| Henry Jameson | United States | Football | 1904 Summer | |
| Kylie Jameson | New Zealand | Sailing | 2004 Summer | |
| Tami Jameson | United States | Handball | 1996 Summer | |
| Toni Jameson | 1996 Summer | |
| Ugo Jametti | Switzerland | 1980 Summer | |
| Khastyn Jamgan | Mongolia | Boxing | 1980 Summer | |
| Segundo Jami | Ecuador | Athletics | 2016 Summer | |
| Alix Jamieson | Great Britain | 1964 Summer | |
| Benjamin Jamieson | Canada | Lacrosse | 1904 Summer | |
| Brad Jamieson | Australia | Athletics | 2000 Summer | |
| Brian Jamieson | United States | Rowing | 1996 Summer | |
| Eric Jamieson | Great Britain | Canoe sprint | 1984 Summer, 1988 Summer, 1992 Summer | |
| Helen Jamieson | Alpine skiing | 1968 Winter | |
| Jane Jamieson | Australia | Athletics | 1996 Summer, 2000 Summer | |
| Mark Jamieson | Track cycling | 2008 Summer | |
| Michael Jamieson | Great Britain | Swimming | 2012 Summer | |
| Sarah Jamieson | Australia | Athletics | 2000 Summer, 2004 Summer, 2008 Summer | |
| Nuraisyah Jamil | Malaysia | Sailing | 2020 Summer | |
| Hind Jamili | Morocco | Canoe slalom | 2016 Summer | |
| Nelson Jamili | Philippines | Boxing | 1984 Summer | |
| Johny Jaminet | Luxembourg | Football | 1952 Summer | |
| Cathy Jamison | United States | Swimming | 1968 Summer | |
| Doug Jamison | Canada | 1972 Summer | |
| Herbert Jamison | United States | Athletics | 1896 Summer | |
| Adama Jammeh | The Gambia | 2016 Summer | |
| Jana Jamnicky | Australia | Handball | 2000 Summer | |
| Hans Jamnig | Austria | Cross country skiing | 1936 Winter | |
| Raymond Jamois | France | Athletics | 1924 Summer | |
| Charles des Jamonières | Shooting | 1936 Summer, 1948 Summer, 1956 Summer | |
| Andrei Jämsä | Estonia | Rowing | 2004 Summer, 2008 Summer, 2012 Summer, 2016 Summer | |
| Mohammad Jamshidabadi | Iran | Boxing | 1948 Summer | |
| Behrouz Jamshidi | Wrestling | 2004 Summer | |
| Mohammad Jamshidi | Basketball | 2020 Summer | |
| Bazarragchaagiin Jamsran | Mongolia | Wrestling | 1972 Summer | |
| Mathias Jamtvedt | Norway | Artistic gymnastics | 1952 Summer | |
| Paulo Jamur | Brazil | Track cycling | 1984 Summer, 1988 Summer | |
| Gunnar Jamvold | Norway | Sailing | 1920 Summer | |
| Peter Jamvold | 1920 Summer | |
| Bogo Jan | Yugoslavia | Ice hockey | 1964 Winter, 1968 Winter, 1972 Winter | |
| Ivo Jan | 1964 Winter, 1968 Winter, 1972 Winter | |
| Mahmoud Jan | Pakistan | Athletics | 1956 Summer | |
| Hanns Jana | West Germany | Fencing | 1976 Summer | |
| Štěpán Janáček | Czech Republic | Athletics | 2000 Summer, 2004 Summer, 2008 Summer | |
| Jitka Janáčková | Czechoslovakia, Czech Republic | Canoe sprint | 1992 Summer, 1996 Summer | |
| Mária Janák | Hungary | Athletics | 1980 Summer | |
| Natascha Janakieva | Bulgaria | Canoe sprint | 1972 Summer, 1976 Summer, 1980 Summer | |
| Kateřina Janatová | Czech Republic | Cross country skiing | 2022 Winter | |
| Emil Janausch | Austria | Athletics | 1932 Summer, 1936 Summer | |
| Andreas Janc | Cross country skiing | 1964 Winter, 1968 Winter | |
| Blaž Janc | Slovenia | Handball | 2016 Summer, 2024 Summer | |
| Lubomír Jančařík | Czech Republic | Table tennis | 2016 Summer, 2020 Summer | |
| Donata Jancewicz | Poland | Athletics | 1992 Summer | |
| Tomáš Jančí | Czechoslovakia | Table tennis | 1992 Summer | |
| Miroslav Jančich | Water polo | 1992 Summer | |
| Dominykas Jančionis | Lithuania | Rowing | 2016 Summer, 2020 Summer | |
| Rebeka Jančová | Slovakia | Alpine skiing | 2022 Winter | |
| Eugeniusz Janczak | Poland | Shooting | 1980 Summer | |
| Krzysztof Janczak | Volleyball | 1996 Summer | |
| Tadeusz Janczenko | Athletics | 1972 Summer | |
| Andrzej Jańczy | Ice hockey | 1980 Winter | |
| Emil Jand [ Wikidata ] | Austria | Rowing | 1912 Summer | |
| Antonín Janda | Czechoslovakia | Football | 1920 Summer | |
| František Janda | Wrestling | 1936 Summer | |
| Jakub Janda | Czech Republic | Ski jumping | 2002 Winter, 2006 Winter, 2010 Winter, 2014 Winter | |
| Jaroslav Janda | Czechoslovakia | Alpine skiing | 1968 Winter | |
| Pavel Janda | Czech Republic | Canoe slalom | 1996 Summer | |
| Alexis Jandard | France | Diving | 2020 Summer, 2024 Summer | |
| František Janda-Suk | Bohemia, Czechoslovakia | Athletics | 1900 Summer, 1912 Summer, 1924 Summer | |
| Otakar Jandera | Czechoslovakia | 1924 Summer, 1928 Summer | |
| František Jandl | Equestrian dressage | 1936 Summer | |
| Eliška Jandová | Rowing | 1992 Summer | |
| Juan Jané | Spain | Water polo | 1968 Summer, 1972 Summer | |
| Refiloe Jane | South Africa | Football | 2012 Summer, 2016 Summer | |
| Pavel Janeček | Czech Republic | Swimming | 2016 Summer | |
| Václav Janeček | Czechoslovakia | Athletics | 1952 Summer, 1956 Summer | |
| Leonia Janecka | Poland | Art competitions | 1928 Summer, 1932 Summer | |
| Ivana Janečková | Czech Republic | Cross country skiing | 2006 Winter, 2010 Winter | |
| Otakar Janecký | Czechoslovakia, Czech Republic | Ice hockey | 1992 Winter, 1994 Winter | |
| Hannelore Janele | Austria | Swimming | 1960 Summer | |
| Halle Janemar | Sweden | Speed skating | 1948 Winter | |
| Riley Janes | Canada | Swimming | 2004 Summer | |
| Albert Janesch | Austria | Art competitions | 1936 Summer | |
| Aurelio Janet | Cuba | Athletics | 1968 Summer | |
| Roberto Janet | 2012 Summer, 2016 Summer | |
| Ingus Janevics | Latvia | 2008 Summer | |
| Jazz Janewattananond | Thailand | Golf | 2020 Summer | |
| Karel Janež | Yugoslavia | Artistic gymnastics | 1948 Summer, 1952 Summer | |
| Luka Janežič | Slovenia | Athletics | 2016 Summer, 2020 Summer | |
| Axel Jang | Germany | Bobsleigh | 1992 Winter | |
| Jang Bong-mun | North Korea | Boxing | 1980 Summer | |
| Jang Byeong-cheol | South Korea | Volleyball | 2000 Summer | |
| Jang Dok-ryong | North Korea | Wrestling | 1972 Summer, 1980 Summer | |
| Jang Dong-lin | South Korea | Biathlon | 1992 Winter | |
| Jang Dong-suk | Field hockey | 1992 Summer | |
| Jang Geum-young | Shooting | 2016 Summer | |
| Jang Hee-sun | Field hockey | 2016 Summer | |
| Jang Hyang-mi | North Korea | Artistic swimming | 2012 Summer | |
| Jang Hye-ji | South Korea | Curling | 2018 Winter | |
| Jang Hye-ock | Badminton | 1996 Summer | |
| Jang Hyun-soo | Football | 2016 Summer | |
| Jang I-hyeon | Wrestling | 1964 Summer | |
| Jang In-gwon | Judo | 1972 Summer | |
| Jang In-won | Speed skating | 1960 Winter | |
| Jang Jae-keun | Athletics | 1984 Summer, 1988 Summer | |
| Jang Jae-sim | Judo | 2000 Summer | |
| Jang Jae-sung | Wrestling | 1996 Summer, 2000 Summer | |
| Jang Jeong-min | Rugby sevens | 2020 Summer | |
| Jang Ji-won | Taekwondo | 2004 Summer | |
| Jang Jong-hyun | Field hockey | 2004 Summer, 2008 Summer, 2012 Summer | |
| Jang Jun | Taekwondo | 2020 Summer | |
| Jang Kang-eun | Rowing | 2008 Summer | |
| Jang Min-hee | Archery | 2020 Summer | |
| Jang Mi-ran | Weightlifting | 2004 Summer, 2008 Summer, 2012 Summer | |
| Jang Myeong-hui | Rowing | 1988 Summer | |
| Jang Ok-rim | North Korea | Volleyball | 1972 Summer | |
| Jang Ri-ra | South Korea | Handball | 1992 Summer | |
| Jang Se-hong | North Korea | Wrestling | 1980 Summer | |
| Jang Seong-min | South Korea | Rugby sevens | 2020 Summer | |
| Jang Sin-kweon | Athletics | 2012 Summer | |
| Jang So-hee | Handball | 2004 Summer | |
| Jang Song-man | North Korea | Table tennis | 2008 Summer, 2012 Summer | |
| Jang Soo-ji | South Korea | Field hockey | 2012 Summer, 2016 Summer | |
| Jang Sung-ho | Baseball | 2000 Summer | |
| Jang Sung-ho | Judo | 2000 Summer, 2004 Summer, 2008 Summer | |
| Jang Sun-hyoung | Basketball | 2000 Summer | |
| Jang Sun-jae | Track cycling | 2012 Summer | |
| Jang Sun-yong | North Korea | Archery | 1976 Summer | |
| Jang Tae-eun | South Korea | Artistic gymnastics | 1984 Summer | |
| Jang Won-sam | Baseball | 2008 Summer | |
| Jang Woo-jin | Table tennis | 2020 Summer, 2024 Summer | |
| Jang Yeong | Speed skating | 1956 Winter, 1960 Winter | |
| Jang Yeong-cheol | Canoe sprint | 1984 Summer, 1988 Summer | |
| Jang Yeon-hak | Weightlifting | 2024 Summer | |
| Jang Yong-ho | Archery | 1996 Summer, 2000 Summer, 2004 Summer | |
| Jang Yu-jin | Freestyle skiing | 2018 Winter, 2022 Winter | |
| Jang Yun-ho | Road cycling | 1984 Summer | |
| Parkpoom Jangphonak | Thailand | Boxing | 1996 Summer, 2000 Summer | |
| Henrik Jangvall | Sweden | Swimming | 1988 Summer | |
| Kim Jang-woo [ Wikidata ] | South Korea | Athletics | 2024 Summer | |
| Pauli Janhonen | Finland | Shooting | 1948 Summer, 1952 Summer, 1960 Summer | |
| Louis Jani | Canada | Judo | 1984 Summer, 1988 Summer | |
| Réka Luca Jani | Hungary | Tennis | 2016 Summer | |
| Bojan Janić | Serbia | Volleyball | 2008 Summer, 2012 Summer | |
| Milan Janić | Yugoslavia | Canoe sprint | 1980 Summer, 1984 Summer | |
| Stjepan Janić | Croatia | 2008 Summer | |
| Miroslav Janíček | Slovakia | Weightlifting | 2004 Summer | |
| Dušan Janićijević | Yugoslavia | Athletics | 1976 Summer | |
| Marina Janicke | East Germany | Diving | 1972 Summer | |
| Artur Janicki [ Wikidata ] | Poland | Speed skating | 2022 Winter | |
| Barbora Janíčková | Czech Republic | Swimming | 2020 Summer | |
| Szymon Janiczko | Poland | Ice hockey | 1956 Winter | |
| Igor Janik | Athletics | 2008 Summer, 2012 Summer | |
| Damian Janikowski | Wrestling | 2012 Summer | |
| Jerzy Janikowski | Fencing | 1972 Summer, 1976 Summer | |
| Hamid Janina | Morocco | Football | 1984 Summer | |
| Ángel Janiquet | Spain | Ski jumping | 1984 Winter | |
| Theodor Janisch | Austria | Shooting | 1936 Summer | |
| Florian Janistyn | Swimming | 2008 Summer, 2012 Summer | |
| Henryk Janiszewski | Poland | Ice hockey | 1980 Winter | |
| Zbigniew Janiszewski | Athletics | 1956 Summer | |
| Dan Janjigian | Armenia | Bobsleigh | 2002 Winter | |
| Farouk Janjoun | Iraq | Boxing | 1980 Summer | |
| Slavko Janjušević | Yugoslavia | Rowing | 1964 Summer | |
| Angelo Jank | Germany | Art competitions | 1936 Summer | |
| Carlo Janka | Switzerland | Alpine skiing | 2010 Winter, 2014 Winter, 2018 Winter | |
| Erika Jänkä | Finland | Biathlon | 2022 Winter | |
| Elmo Jankari | Equestrian eventing | 2016 Summer | |
| Vladas Jankauskas | Lithuania | Road cycling | 1928 Summer | |
| Friedrich Janke | Germany | Athletics | 1956 Summer, 1960 Summer | |
| Gabriele Janke | East Germany | Fencing | 1980 Summer | |
| Karin Janke | West Germany | Athletics | 1988 Summer | |
| Michael Janker | Germany | Shooting | 2016 Summer | |
| Horst Jankhöfer | East Germany | Handball | 1972 Summer | |
| Jan Jankiewicz | Poland | Track cycling, Road cycling | 1976 Summer, 1980 Summer | |
| Eva Janko | Austria | Athletics | 1968 Summer, 1972 Summer, 1976 Summer | |
| Lubomír Janko | Czechoslovakia | Rowing | 1980 Summer | |
| Martin Jankovec | Slovakia | Canoe sprint | 2012 Summer | |
| Jasmina Janković | Netherlands | Handball | 2016 Summer | |
| Jelena Janković | Serbia and Montenegro, Serbia | Tennis | 2004 Summer, 2008 Summer, 2012 Summer, 2016 Summer | |
| Ljubinka Janković | Yugoslavia | Handball | 1984 Summer, 1988 Summer | |
| Marko Janković | Serbia and Montenegro | Athletics | 2000 Summer | |
| Maša Janković | Serbia | Basketball | 2024 Summer | |
| Zoran Janković | Yugoslavia | Water polo | 1964 Summer, 1968 Summer, 1972 Summer | |
| István Jankovich | Hungary | Athletics | 1912 Summer | |
| Lőrinc Jankovich | Equestrian eventing | 1936 Summer | |
| Tibor Jankovics | Czechoslovakia | Wrestling | 1988 Summer | |
| Tristan Jankovics | Canada | Swimming | 2024 Summer | |
| Sandra Jankowiak | Poland | Sailing | 2024 Summer | |
| Stanisław Jankowiak | Canoe sprint | 1964 Summer | |
| Jan Jankowicz | Artistic gymnastics | 1964 Summer | |
| Elżbieta Jankowska | Rowing | 1988 Summer | |
| Edmund Jankowski | 1928 Summer | |
| Marian Jankowski | Weightlifting | 1960 Summer | |
| Miłosz Jankowski | Rowing | 2016 Summer | |
| Tadeusz Jankowski | Cross country skiing | 1964 Winter | |
| Wojciech Jankowski | Rowing | 1988 Summer, 1992 Summer, 1996 Summer | |
| Tomáš Janků | Czech Republic | Athletics | 1996 Summer, 2004 Summer, 2008 Summer | |
| Marek Jankulovski | Football | 2000 Summer | |
| Julieta Jankunas | Argentina | Field hockey | 2020 Summer, 2024 Summer | |
| Paulius Jankūnas | Lithuania | Basketball | 2012 Summer, 2016 Summer | |
| Bill Jankunis | United States | Athletics | 1976 Summer | |
| Max Janlet | Belgium | Fencing | 1928 Summer, 1932 Summer | |
| Gilda Jannaccone | Italy | Athletics | 1960 Summer | |
| Abdulieh Janneh [ Wikidata ] | The Gambia | 1992 Summer | |
| Jean-François Jannekeyn | France | Fencing | 1924 Summer | |
| Craig Janney | United States | Ice hockey | 1988 Winter | |
| Antonio Janni | Italy | Football | 1928 Summer | |
| Gerrit Jannink | Netherlands | Field hockey | 1928 Summer | |
| Boyd Janny | United States | Handball | 1988 Summer | |
| Madelen Janogy | Sweden | Football | 2020 Summer | |
| Arvydas Janonis | Soviet Union | 1988 Summer | |
| Branislav Jánoš | Slovakia | Ice hockey | 1994 Winter, 1998 Winter | |
| Vladimír Jánoš | Czechoslovakia | Rowing | 1968 Summer, 1972 Summer, 1976 Summer | |
| Mark Janoschak | Canada | Figure skating | 1992 Winter | |
| Ferenc Jánosi | Hungary | Volleyball | 1964 Summer | |
| Zsuzsa Jánosi | Fencing | 1988 Summer, 1992 Summer, 1996 Summer | |
| Miroslava Jánošíková | Czechoslovakia | Judo | 1992 Summer | |
| Jolanta Janota | Poland | Athletics | 1988 Summer | |
| Miroslav Janota | Czechoslovakia | Wrestling | 1972 Summer, 1976 Summer, 1980 Summer | |
| Bohumil Janoušek | Rowing | 1960 Summer, 1964 Summer | |
| Gabriel Janoušek | Canoe slalom | 1972 Summer | |
| Ladislav Janoušek | Road cycling | 1920 Summer | |
| Anna Janoušková | Cross country skiing | 1992 Winter | |
| Mlađan Janović | Montenegro | Water polo | 2008 Summer, 2012 Summer, 2016 Summer | |
| Nikola Janović | 2008 Summer, 2012 Summer | |
| László Jánovszki | Hungary | Handball | 1976 Summer, 1980 Summer | |
| Jerzy Janowicz | Poland | Tennis | 2016 Summer | |
| Jarosław Janowski | Rowing | 1992 Summer | |
| Julius Janowsky | Austria | Diving | 1952 Summer | |
| Melik Janoyan | Armenia | Athletics | 2008 Summer, 2012 Summer | |
| Edward Jans | Canada | Shooting | 1972 Summer | |
| Herbert Jans | Chile | Rowing | 2000 Summer | |
| Janko Janša | Yugoslavia | Cross country skiing | 1928 Winter | |
| Joško Janša | 1928 Winter | |
| Milan Janša | Yugoslavia, Slovenia | Rowing | 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer | |
| Miloš Janša | Yugoslavia | 1972 Summer | |
| Libbie Janse van Rensburg | South Africa | Rugby sevens | 2024 Summer | |
| Axel Janse | Sweden | Artistic gymnastics | 1912 Summer | |
| Roy Janse | Canada | Sailing | 1996 Summer | |
| Maurice Jansegers | Belgium | Art competitions | 1936 Summer | |
| Jansen | Brazil | Football | 1952 Summer | |
| Daniel Jansen Van Doorn | Canada | Volleyball | 2016 Summer | |
| Birger Jansen | Norway | Ice hockey | 1972 Winter | |
| Ciska Jansen | Netherlands | Athletics | 1976 Summer | |
| Dan Jansen | United States | Speed skating | 1984 Winter, 1988 Winter, 1992 Winter, 1994 Winter | |
| Eelco Jansen | Netherlands | Baseball | 1996 Summer, 2000 Summer, 2004 Summer | |
| Ella Jansen | Canada | Swimming | 2024 Summer | |
| Haakon Jansen | Norway | Athletics | 1924 Summer | |
| Harrie Jansen | Netherlands | Road cycling | 1968 Summer | |
| Hernán Jansen | Venezuela | Fencing | 2012 Summer | |
| Inge Jansen | Netherlands | Diving | 2020 Summer | |
| Jacques Jansen | Art competitions | 1928 Summer | |
| Jan Jansen | Track cycling | 1968 Summer | |
| Joeri Jansen | Belgium | Athletics | 2004 Summer | |
| John Jansen | Netherlands | Water polo | 1992 Summer | |
| Karl Jansen | Germany | Weightlifting | 1936 Summer | |
| Kati Jansen | Swimming | 1952 Summer, 1956 Summer | |
| Leen Jansen | Netherlands | Boxing | 1952 Summer | |
| Louise Mai Jansen | Denmark | Swimming | 2004 Summer, 2008 Summer | |
| Monique Jansen | Netherlands | Athletics | 2012 Summer | |
| Patrick Jansen | India | Field hockey | 1948 Summer | |
| Renate Jansen | Netherlands | Football | 2020 Summer | |
| Ronald Jansen | Field hockey | 1988 Summer, 1996 Summer, 2000 Summer | |
| Roy Jansen | Norway | Ice hockey | 1972 Winter | |
| Torsten Jansen | Germany | Handball | 2004 Summer, 2008 Summer | |
| Ulli Jansen | Ice hockey | 1956 Winter, 1960 Winter, 1964 Winter | |
| Yibbi Jansen | Netherlands | Field hockey | 2024 Summer | |
| Klaudia Jans-Ignacik | Poland | Tennis | 2008 Summer, 2012 Summer, 2016 Summer | |
| Szilárd Jansik | Hungary | Water polo | 2020 Summer, 2024 Summer | |
| Josef Jánský | Czechoslovakia | Athletics | 1972 Summer, 1980 Summer | |
| Sijtse Jansma | Netherlands | Tug of war | 1920 Summer | |
| Sybren Jansma | Bobsleigh | 2006 Winter, 2010 Winter, 2014 Winter | |
| Jonathan Janson | Great Britain | Sailing | 1956 Summer, 1960 Summer | |
| Lacy Janson | United States | Athletics | 2012 Summer | |
| Pauline Janson | Great Britain | Rowing | 1980 Summer | |
| Liene Jansone | Latvia | Basketball | 2008 Summer | |
| Aigars Jansons | Wrestling | 1996 Summer | |
| Dans Jansons | Freestyle skiing | 1992 Winter | |
| Jānis Jansons | Bobsleigh | 2018 Winter | |
| Kjetil Jansrud | Norway | Alpine skiing | 2006 Winter, 2010 Winter, 2014 Winter, 2018 Winter, 2022 Winter | |
| Anna Janssen | Germany | Shooting | 2024 Summer | |
| Dirk Janssen | Netherlands | Artistic gymnastics | 1908 Summer | |
| Dominique Janssen | Football | 2020 Summer | |
| Hans Janssen [ Wikidata ] | Art competitions | 1948 Summer | |
| Henrik Janssen | Germany | Athletics | 2024 Summer | |
| Henk Janssen | Netherlands | Tug of war | 1920 Summer | |
| Inge Janssen | Rowing | 2012 Summer, 2016 Summer, 2020 Summer | |
| Jan Janssen | Road cycling | 1960 Summer | |
| Jan Janssen | Ice hockey | 1980 Winter | |
| Jip Janssen | Field hockey | 2020 Summer, 2024 Summer | |
| Marie Janssen | Belgium | Tennis | 1924 Summer | |
| Martine Janssen | Netherlands | Swimming | 1992 Summer | |
| Miguel Janssen | Aruba | Athletics | 1996 Summer | |
| Olaf Janßen | West Germany | Football | 1988 Summer | |
| Bernard Janssens | Belgium | Road cycling, Track cycling | 1920 Summer | |
| Christelle Janssens | Swimming | 1988 Summer | |
| Daniel Janssens | Athletics | 1952 Summer | |
| Frits Janssens | Wrestling | 1920 Summer, 1924 Summer, 1928 Summer | |
| Hillary Janssens | Canada | Rowing | 2020 Summer | |
| Joseph Janssens | Belgium | Shooting | 1920 Summer | |
| Ko Janssens | Netherlands | Boxing | 1920 Summer | |
| Ward Janssens | Belgium | Short track speed skating | 2002 Winter | |
| Åke Jansson | Sweden | Athletics | 1936 Summer | |
| Albin Jansson | Ice hockey | 1920 Summer | |
| Axel Jansson | Shooting | 1908 Summer | |
| Bernt Jansson | Speed skating | 1976 Winter | |
| Bertil Jansson | Athletics | 1920 Summer, 1924 Summer | |
| Bo Jansson | Modern pentathlon | 1964 Summer, 1972 Summer | |
| Carina Jansson | Shooting | 1988 Summer | |
| Christer Jansson | 1972 Summer | |
| Erik Jansson | Road cycling | 1928 Summer | |
| Folke Jansson | Athletics | 1920 Summer, 1924 Summer | |
| Gösta Jansson | Finland | 1924 Summer | |
| Gunnar Jansson | Sweden | 1932 Summer, 1936 Summer | |
| Gustaf Jansson | 1952 Summer | |
| Harry Jansson | Speed skating | 1948 Winter | |
| Helge Jansson | Athletics | 1924 Summer, 1928 Summer | |
| Herold Jansson | Denmark | Diving, Artistic gymnastics | 1920 Summer, 1924 Summer | |
| Jesper Jansson | Sweden | Football | 1992 Summer | |
| Johan Jansson | Diving | 1912 Summer, 1920 Summer, 1924 Summer | |
| Kaarle Jansson [ Wikidata ] | Finland | Artistic gymnastics | 1912 Summer | |
| Nanna Jansson | Sweden | Ice hockey | 2002 Winter, 2006 Winter | |
| Peter Jansson | Bobsleigh | 1980 Winter | |
| Ragnar Jansson | Finland | Sailing | 1948 Summer, 1952 Summer | |
| Roger Jansson | Sweden | Shooting | 1984 Summer | |
| Rune Jansson | Wrestling | 1956 Summer, 1960 Summer | |
| Sixten Jansson | Canoe sprint | 1936 Summer | |
| Viktor Jansson | Finland | Equestrian jumping | 1952 Summer | |
| Benyapa Jantawan | Thailand | Sailing | 2024 Summer | |
| Ekkachai Janthana | Athletics | 1996 Summer | |
| Mendbayaryn Jantsankhorloo | Mongolia | Shooting | 1968 Summer, 1972 Summer, 1976 Summer, 1980 Summer | |
| Pontus Jäntti | Finland | Badminton | 1992 Summer, 1996 Summer | |
| Charles January | United States | Football | 1904 Summer | |
| John January | 1904 Summer | |
| Shakira January | South Africa | Water polo | 2020 Summer | |
| Thomas January | United States | Football | 1904 Summer | |
| Jolanta Januchta | Poland | Athletics | 1980 Summer | |
| Dimitrios Janulidis | Czechoslovakia | Artistic gymnastics | 1976 Summer | |
| Kinga Janurik | Hungary | Handball | 2020 Summer, 2024 Summer | |
| Marjan Janus | Netherlands | Swimming | 1968 Summer | |
| Miroslav Januš | Czechoslovakia, Czech Republic | Shooting | 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer | |
| Vytautas Janušaitis | Lithuania | Swimming | 2004 Summer, 2008 Summer, 2012 Summer | |
| Stasys Janušauskas | Football | 1924 Summer | |
| Ieva Januškevičiūtė | Alpine skiing | 2014 Winter, 2018 Winter | |
| Ewald Janusz | Poland | Canoe sprint | 1968 Summer | |
| Marcin Janusz | Volleyball | 2024 Summer | |
| Paweł Januszewski | Athletics | 1996 Summer, 2000 Summer | |
| Zbigniew Januszkiewicz | Swimming | 1980 Summer | |
| Kip Janvrin | United States | Athletics | 2000 Summer | |
| Alex Jany | France | Swimming, Water polo | 1948 Summer, 1952 Summer, 1956 Summer, 1960 Summer | |
| Jacques Jany | Bobsleigh | 1924 Winter | |
| Patrik Jány | Slovakia | Shooting | 2020 Summer, 2024 Summer | |
| Britt Janyk | Canada | Alpine skiing | 2010 Winter | |
| Michael Janyk | 2006 Winter, 2010 Winter, 2014 Winter | |
| Ginette Jany-Sendral | France | Swimming | 1948 Summer, 1952 Summer, 1956 Summer | |
| Helmut Janz | Germany | Athletics | 1960 Summer | |
| Aurelia-Maxima Janzen | Switzerland | Rowing | 2024 Summer | |
| Jacqueline Janzen | Germany | Ice hockey | 2014 Winter | |
| Ahmed Jaouadi | Tunisia | Swimming | 2024 Summer | |
| Antoine Jaoude | Brazil | Wrestling | 2004 Summer | |
| Otar Japaridze | Georgia | Figure skating | 2010 Winter | |
| Soso Japharidze [ Wikidata ] | Alpine skiing | 2022 Winter | |
| Andreas Japtok | West Germany | Artistic gymnastics | 1984 Summer | |
| Joseph Jaquenoud | Switzerland | Weightlifting | 1924 Summer, 1928 Summer | |
| Léo Le Blé Jaques | France | Snowboarding | 2022 Winter | |
| Gilles Jaquet | Switzerland | 1998 Winter, 2002 Winter, 2006 Winter | |
| Sabrina Jaquet | Badminton | 2012 Summer, 2016 Summer, 2020 Summer | |
| Clarence Jaquith | United States | Athletics | 1920 Summer | |
| Fernando Jara | Chile | Football | 1952 Summer | |
| Irenio Jara | 1952 Summer | |
| Juan Ramón Jara | Paraguay | 1992 Summer | |
| Stanislav Jarábek | Czechoslovakia | 1968 Summer | |
| Jozef Jarabinský | 1968 Summer | |
| Boris Jarak | Yugoslavia | Handball | 1988 Summer | |
| Alfonso Jaramillo | Colombia | Football | 1968 Summer | |
| Balbino Jaramillo | Track cycling | 1984 Summer | |
| Carlos Jaramillo | Road cycling | 1984 Summer | |
| Jorge Jaramillo | Swimming | 1972 Summer, 1976 Summer | |
| Karla Jaramillo | Ecuador | Athletics | 2020 Summer | |
| Lucy Jaramillo | 2012 Summer | |
| Kurt Jarasinski | Germany | Equestrian jumping | 1964 Summer | |
| Jarbas | Brazil | Football | 1976 Summer | |
| Patrik Järbyn | Sweden | Alpine skiing | 1994 Winter, 1998 Winter, 2002 Winter, 2006 Winter, 2010 Winter | |
| Andrea Jardi | Spain | 2010 Winter | |
| Lucrécia Jardim | Portugal | Athletics | 1992 Summer, 1996 Summer | |
| Anne Jardin | Canada | Swimming | 1976 Summer | |
| Barbara Jardin | 2012 Summer | |
| Henri Jardin | France | Athletics | 1908 Summer | |
| Véronique Jardin | Swimming | 1984 Summer, 1992 Summer | |
| Adrian Jardine | Great Britain | Sailing | 1964 Summer, 1968 Summer | |
| Charles Jardine | Australia | Boxing | 1924 Summer | |
| Frank Jardine | Great Britain | Ice hockey | 1948 Winter | |
| Stuart Jardine | Sailing | 1968 Summer, 1972 Summer | |
| Jardinier [ Wikidata ] | France | Artistic gymnastics | 1900 Summer | |
| Eduardo Jardón | Spain | Field hockey | 1948 Summer | |
| Fernando Jardón | 1948 Summer | |
| Francisco Jardón | 1948 Summer | |
| Aleksandra Jarecka | Poland | Fencing | 2020 Summer, 2024 Summer | |
| Bogusław Jarecki | Equestrian eventing | 1988 Summer, 1992 Summer, 1996 Summer | |
| Dave Jareckie | United States | Biathlon | 1994 Winter | |
| Zbigniew Jaremski | Poland | Athletics | 1972 Summer, 1976 Summer | |
| Ganbatyn Jargalanchuluun | Mongolia | Short track speed skating | 2002 Winter | |
| Luvsandagvyn Jargalsaikhan | Road cycling | 1980 Summer | |
| Nyamyn Jargalsaikhan | Wrestling | 1976 Summer | |
| Matarr Jarju | The Gambia | 1988 Summer | |
| Bakary Jarjue | Athletics | 1984 Summer | |
| Zyta Jarka | Poland | Rowing | 1988 Summer | |
| Hanna Jarkiewicz | 1980 Summer | |
| Olga Jarkova | Russia | Curling | 2002 Winter, 2006 Winter | |
| Zdeněk Jarkovský | Czechoslovakia | Ice hockey | 1948 Winter | |
| Anders Jarl | Sweden | Road cycling | 1988 Summer | |
| Viggo Jarl | Denmark | Art competitions | 1928 Summer | |
| Johan Jarlén | Sweden | Artistic gymnastics | 1908 Summer | |
| Karin Jarl-Sakellarios | Austria | Art competitions | 1948 Summer | |
| Øystein Jarlsbo | Norway | Ice hockey | 1980 Winter, 1984 Winter | |
| Jake Jarman | Great Britain | Artistic gymnastics | 2024 Summer | |
| Rolf Järmann | Switzerland | Road cycling | 1996 Summer | |
| Ewald Jarmer | West Germany | Boxing | 1972 Summer | |
| Aleksandra Jarmolińska | Poland | Shooting | 2016 Summer, 2020 Summer | |
| Tarik El Jarmouni | Morocco | Football | 2000 Summer | |
| Heikki Järn | Finland | Ice hockey | 1972 Winter | |
| Tihomir Jarnjević | Croatia | Rowing | 2000 Summer | |
| Ann-Sofie Järnström | Sweden | Speed skating | 1972 Winter, 1976 Winter, 1980 Winter | |
| Jerzy Jarnuszkiewicz | Poland | Art competitions | 1948 Summer | |
| Władysław Jarocki | 1928 Summer | |
| Prapawadee Jaroenrattanatarakoon | Thailand | Weightlifting | 2008 Summer | |
| Somharuthai Jaroensiri | Badminton | 1992 Summer, 1996 Summer | |
| Ralf Jaros | West Germany, Germany | Athletics | 1984 Summer, 1992 Summer | |
| Nadine Jarosch | Germany | Artistic gymnastics | 2012 Summer | |
| Paweł Jarosiński | Poland | Rowing | 2000 Summer | |
| Jakub Jarosz | Volleyball | 2012 Summer | |
| Maciej Jarosz | 1980 Summer | |
| Paweł Jaroszek | Speed skating | 1992 Winter, 1994 Winter | |
| Abdullah Jaroudi Sr. | Lebanon | Shooting | 1952 Summer | |
| Abdullah Jaroudi Jr. | 1960 Summer | |
| Peder Järphag | Sweden | Handball | 1988 Summer | |
| José Francisco Jarque | Spain | Track cycling | 2000 Summer | |
| John Jarrett | United States | Nordic combined | 1994 Winter, 1998 Winter | |
| Patrick Jarrett | Jamaica | Athletics | 2000 Summer, 2004 Summer | |
| Tony Jarrett | Great Britain | 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer | |
| Antoine Jarrety | France | 1920 Summer | |
| Alberto Jarrín | Ecuador | 1924 Summer | |
| Jhon Jarrín | Track cycling | 1980 Summer | |
| Nicolás Jarry | Chile | Tennis | 2024 Summer | |
| Rachel Jarry | Australia | Basketball | 2012 Summer, 2016 Summer | |
| Anders Järryd | Sweden | Tennis | 1988 Summer, 1992 Summer | |
| Yacob Jarso | Ethiopia | Athletics | 2008 Summer | |
| Emil Järudd | Sweden | Sailing | 2020 Summer, 2024 Summer | |
| Avijaja Lund Järund | Denmark | Curling | 2002 Winter | |
| Nestori Järvelä | Finland | Athletics | 1924 Summer | |
| Satu Järvelä | Snowboarding | 1998 Winter | |
| Hannu Järvenpää | Ice hockey | 1992 Winter | |
| Tero Järvenpää | Athletics | 2008 Summer | |
| Väinö Järvenpää | Boxing | 1960 Summer | |
| Martti Järventaus | Swimming | 1980 Summer, 1984 Summer | |
| Iiro Järvi | Ice hockey | 1988 Winter | |
| Jyrki Järvi | Sailing | 2000 Summer | |
| Tyyne Järvi | Swimming | 1912 Summer | |
| Paul Jarvie | Australia | 1972 Summer, 1976 Summer | |
| Kalle Järvilehto | Finland | Snowboarding | 2018 Winter, 2022 Winter | |
| Steve Jarvin | Australia | Sailing | 1996 Summer | |
| Akilles Järvinen | Finland | Athletics | 1928 Summer, 1932 Summer, 1936 Summer | |
| Erkki Järvinen | 1928 Summer | |
| Esko Järvinen | Nordic combined, Ski jumping | 1928 Winter | |
| Juhani Järvinen | Speed skating | 1956 Winter, 1960 Winter, 1964 Winter | |
| Kalle Järvinen | Athletics | 1932 Summer | |
| Matti Järvinen | 1932 Summer, 1936 Summer | |
| Ritva Järvinen | Swimming | 1952 Summer | |
| Timo Järvinen | Speed skating | 1988 Winter, 1992 Winter | |
| Verner Järvinen | Athletics | 1908 Summer, 1912 Summer | |
| Calum Jarvis | Great Britain | Swimming | 2020 Summer | |
| Chris Jarvis | Canada | Rowing | 2004 Summer | |
| Christine Jarvis | Great Britain | Swimming | 1972 Summer, 1976 Summer | |
| Debbie Jarvis | Sailing | 1988 Summer, 1992 Summer | |
| Frank Jarvis | United States | Athletics | 1900 Summer | |
| Howard Jarvis | Great Britain | Art competitions | 1948 Summer | |
| Jared Jarvis | Antigua and Barbuda | Athletics | 2016 Summer | |
| John Arthur Jarvis | Great Britain | Swimming, Water polo | 1900 Summer, 1908 Summer | |
| Korey Jarvis | Canada | Wrestling | 2016 Summer | |
| Morgan Jarvis | Rowing | 2012 Summer | |
| Tony Jarvis | Great Britain | Swimming | 1968 Summer | |
| Walter Jarvis | Australia | Rowing | 1924 Summer | |
| Milan Jarý | Czechoslovakia | Cross country skiing | 1976 Winter | |
| Vladimír Jarý | Handball | 1972 Summer, 1976 Summer | |
| Jan Jarzembowski | Poland | Athletics | 1956 Summer, 1960 Summer | |
| Mirosław Jarzembowski | Rowing | 1980 Summer | |
| Karolina Jarzyńska | Athletics | 2012 Summer, 2020 Summer | |
| Simas Jasaitis | Lithuania | Basketball | 2008 Summer, 2012 Summer | |
| Beate Jasch | West Germany | Swimming | 1976 Summer | |
| Willi Jaschek | Artistic gymnastics | 1968 Summer | |
| Martina Jäschke | East Germany | Diving | 1980 Summer | |
| Peter Jaschke | West Germany | Handball | 1976 Summer | |
| Stanislav Jasečko | Slovakia | Ice hockey | 1998 Winter | |
| Hernán Jasen | Argentina | Basketball | 2012 Summer | |
| Mária Jasenčáková | Czechoslovakia, Slovakia | Luge | 1980 Winter, 1984 Winter, 1992 Winter, 1994 Winter, 1998 Winter | |
| Rolandas Jasevičius | Lithuania | Boxing | 2004 Summer | |
| Michał Jasiczek | Poland | Alpine skiing | 2014 Winter, 2018 Winter, 2022 Winter | |
| Šarūnas Jasikevičius | Lithuania | Basketball | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer | |
| Ali Jasim [ Wikidata ] | Iraq | Football | 2024 Summer | |
| Hussain Jasim | Athletics | 1996 Summer | |
| Iman Essa Jasim | Bahrain | 2016 Summer | |
| Omar Jasim | Swimming | 2008 Summer | |
| Edyta Jasińska | Poland | Track cycling | 2016 Summer | |
| Małgorzata Jasińska | Road cycling | 2016 Summer | |
| Gintaras Jasinskas | Lithuania | Biathlon | 1992 Winter, 1994 Winter | |
| Daniel Jasinski | Germany | Athletics | 2016 Summer, 2020 Summer | |
| Kazimierz Jasiński | Poland | Road cycling | 1968 Summer | |
| Stanisław Jasiński | Equestrian eventing | 1980 Summer | |
| Tomasz Jasiński | Ice hockey | 1948 Winter | |
| Zbigniew Jasiukiewicz | Volleyball | 1968 Summer | |
| Liveta Jasiūnaitė | Lithuania | Athletics | 2020 Summer, 2024 Summer | |
| Rytis Jasiūnas [ Wikidata ] | Sailing | 2024 Summer | |
| Aatos Jaskari | Finland | Wrestling | 1932 Summer, 1936 Summer | |
| Tauno Jaskari | 1952 Summer, 1956 Summer, 1960 Summer, 1964 Summer | |
| Mieczysław Jaskierski | Poland | Ice hockey | 1976 Winter | |
| Adrian Jaskiewicz [ Wikidata ] | Swimming | 2024 Summer | |
| Marek Jaskółka | Triathlon | 2008 Summer, 2012 Summer | |
| Jan Jaskólski | Athletics | 1960 Summer, 1964 Summer, 1968 Summer | |
| Norbert Jaskot | Fencing | 1992 Summer, 1996 Summer, 2000 Summer | |
| Miroslava Jaškovská | Czechoslovakia | Cross country skiing | 1976 Winter | |
| Sylwia Jaśkowiec | Poland | 2010 Winter, 2014 Winter, 2018 Winter | |
| Zenon Jaskuła | Road cycling | 1988 Summer | |
| Stanisław Jaskułka | Athletics | 1980 Summer | |
| Obaid Al-Jasmi | United Arab Emirates | Swimming | 2004 Summer, 2008 Summer | |
| Anju Jason | Marshall Islands | Taekwondo | 2008 Summer | |
| Iän Jason | France | Rugby sevens | 2024 Summer | |
| Rebecca Jasontek | United States | Artistic swimming | 2004 Summer | |
| Marrit Jasper | Netherlands | Volleyball | 2024 Summer | |
| Matthew Jasper | Great Britain | Short track speed skating | 1992 Winter, 1998 Winter | |
| Stijn Jaspers | Netherlands | Athletics | 1984 Summer | |
| Koba Jass | Latvia | Ice hockey | 2014 Winter | |
| Abdul Rahman Jassim | Bahrain | Modern pentathlon | 1984 Summer | |
| Ahmad Jassim | Iraq | Football | 1988 Summer | |
| Emad Jassim | 1984 Summer | |
| Farhan Jassim | Wrestling | 1988 Summer | |
| Saad Jassim | Football | 1980 Summer | |
| Salwan Jassim | Weightlifting | 2016 Summer | |
| Ferdinand Jassogne | Belgium | Fencing | 1948 Summer | |
| Megan Jastrab | United States | Track cycling | 2020 Summer | |
| Burton Jastram | Rowing | 1932 Summer | |
| Chet Jastremski | Swimming | 1964 Summer, 1968 Summer | |
| Wojciech Jastrzębowski | Poland | Art competitions | 1932 Summer | |
| Petra Jászapáti | Hungary | Short track speed skating | 2018 Winter, 2022 Winter | |
| Bartłomiej Jaszka | Poland | Handball | 2008 Summer | |
| Ádám Jászó [ Wikidata ] | Hungary | Swimming | 2024 Summer | |
| Bhawna Jat | India | Athletics | 2020 Summer | |
| Simone Jatobá | Brazil | Football | 2000 Summer, 2008 Summer | |
| Jurek Jatowitt | Austria | Judo | 1976 Summer | |
| Anouck Jaubert | France | Sport climbing | 2020 Summer | |
| Charles de Jaubert | Shooting | 1900 Summer, 1912 Summer | |
| Monica Jauca | Romania | Biathlon | 1992 Winter | |
| Alfred Jauch | Switzerland | Wrestling | 1948 Summer | |
| Eugenio Jáudenes | Spain | Sailing | 1968 Summer | |
| Juris Jaudzems | Soviet Union | Bobsleigh | 1988 Winter | |
| Heidi Jaufenthaler | Austria | Snowboarding | 1998 Winter | |
| Bob Jaugstetter | United States | Rowing | 1984 Summer | |
| Meiliana Jauhari | Indonesia | Badminton | 2012 Summer | |
| Sami Jauhojärvi | Finland | Cross country skiing | 2006 Winter, 2010 Winter, 2014 Winter | |
| Đurđina Jauković | Montenegro | Handball | 2016 Summer, 2020 Summer | |
| Hans-Georg Jaunich | East Germany | 1980 Summer | |
| Inese Jaunzeme | Soviet Union | Athletics | 1956 Summer | |
| Gerardo Jáuregui | Argentina | Equestrian eventing | 1972 Summer | |
| José María Jáuregui | Spain | Football | 1928 Summer | |
| Adolphe Jauréguy | France | Rugby | 1924 Summer | |
| Bohumil Jauris | Czechoslovakia | Speed skating | 1956 Winter | |
| Jean-Denis Jaussaud | France | Cross country skiing | 1984 Winter | |
| Ebrahim Javadi | Iran | Wrestling | 1972 Summer | |
| Mirmostafa Javadi | Weightlifting | 2024 Summer | |
| Alica Javadová | Slovakia | Athletics | 1996 Summer | |
| Hrachik Javakhyan | Armenia | Boxing | 2008 Summer | |
| Arto Javanainen | Finland | Ice hockey | 1984 Winter | |
| Ahad Javansalehi | Iran | Wrestling | 1988 Summer, 1992 Summer | |
| Mahsa Javar | Rowing | 2016 Summer, 2024 Summer | |
| Muhammad Javed | Pakistan | Field hockey | 2008 Summer | |
| Jessica Javelet | United States | Rugby sevens | 2016 Summer | |
| Monique Javer | Great Britain | Tennis | 1992 Summer | |
| Mark Javier | Philippines | Archery | 2008 Summer, 2012 Summer | |
| Boldyn Javkhlantögs | Mongolia | Wrestling | 1988 Summer, 1992 Summer | |
| Byambajavyn Javkhlantögs | 1976 Summer | |
| Borut Javornik | Slovenia | Canoe slalom | 1992 Summer | |
| Helena Javornik | Athletics | 1996 Summer, 2000 Summer, 2004 Summer | |
| Robertas Javtokas | Lithuania | Basketball | 2004 Summer, 2008 Summer, 2016 Summer | |
| Josef Javůrek | Bohemia, Czechoslovakia | Fencing | 1912 Summer, 1920 Summer, 1924 Summer | |
| Jigjeegiin Javzandulam | Mongolia | Cross country skiing | 1964 Winter | |
| Abdul-Khaliq Jawad | Iraq | Weightlifting | 1964 Summer | |
| Abdul-Zahra Jawad | Boxing | 1980 Summer | |
| Kashif Jawad | Pakistan | Field hockey | 2000 Summer, 2004 Summer | |
| Marlena Jawaid [ Wikidata ] | Sweden | Modern pentathlon | 2024 Summer | |
| Sameer Jawdat | Saudi Arabia | Archery | 1988 Summer | |
| Youssef Jawdat | 1984 Summer | |
| Jabou Jawo | The Gambia | Athletics | 1984 Summer, 1988 Summer | |
| Daniela Jaworska | Poland | 1968 Summer, 1972 Summer | |
| Edward Jaworski | United States | Water polo | 1952 Summer | |
| Jakub Jaworski | Poland | Short track speed skating | 2010 Winter | |
| Józef Jaworski | Athletics | 1924 Summer, 1928 Summer | |
| Robert Jaworski | Philippines | Basketball | 1968 Summer | |
| Allan Jay | Great Britain | Fencing | 1952 Summer, 1956 Summer, 1960 Summer, 1964 Summer, 1968 Summer | |
| Deborah Jay | Diving | 1980 Summer | |
| Maurice Jay [ Wikidata ] | France | Fencing | 1900 Summer | |
| Oscar Jay | Archery | 1908 Summer | |
| Renaud Jay | Cross country skiing | 2014 Winter, 2022 Winter | |
| Vincent Jay | Biathlon | 2010 Winter | |
| Valdivel Jayalakshmi | India | Athletics | 2000 Summer | |
| Susanthika Jayasinghe | Sri Lanka | 1996 Summer, 2000 Summer, 2008 Summer | |
| Thilini Jayasinghe | Badminton | 2008 Summer, 2012 Summer | |
| Chandrasena Jayasuriya | Boxing | 1956 Summer | |
| Hempala Jayasuriya | 1956 Summer | |
| Maud Jayet | Switzerland | Sailing | 2020 Summer, 2024 Summer | |
| Carlos Jayme | Brazil | Swimming | 2000 Summer, 2004 Summer | |
| Cesar Jayme | Philippines | Shooting | 1948 Summer, 1952 Summer, 1956 Summer, 1960 Summer | |
| John Jayne | United States | Judo | 2024 Summer | |
| Travis Jayner | Short track speed skating | 2010 Winter | |
| Jasurbek Jaysunov | Uzbekistan | Taekwondo | 2024 Summer | |
| Ravi Jayewardene | Sri Lanka | Shooting | 1964 Summer | |
| Mohamed Jazaeri | Syria | Football | 1980 Summer | |
| Janez Jazbec | Slovenia | Alpine skiing | 2010 Winter | |
| Erik Jazet | Netherlands | Field hockey | 1996 Summer, 2000 Summer, 2004 Summer | |
| Ahmed Jaziri | Tunisia | Athletics | 2024 Summer | |
| Malek Jaziri | Tennis | 2012 Summer, 2016 Summer | |
| Arsenio Jazmin | Philippines | Athletics | 1964 Summer | |
| Michel Jazy | France | 1956 Summer, 1960 Summer, 1964 Summer | |
| Mohamed Jbour | Jordan | Shooting | 1980 Summer, 1984 Summer | |
| Oksana Jdanoviç [ Wikidata ] | Belarus | Rhythmic gymnastics | 1996 Summer | |
| Je Seong-tae | South Korea | Shooting | 2004 Summer | |
| Wendy Jeal | Great Britain | Athletics | 1988 Summer | |
| Ange Jean Baptiste | Haiti | Judo | 2008 Summer | |
| Aurore Jean | France | Cross country skiing | 2010 Winter, 2014 Winter, 2018 Winter | |
| Caleb Jean | Haiti | Judo | 1992 Summer | |
| Mulern Jean | Athletics | 2016 Summer, 2020 Summer | |
| Olivier Jean | Canada | Short track speed skating, Speed skating | 2010 Winter, 2014 Winter, 2018 Winter | |
| Valérie Jean-Charles | France | Athletics | 1992 Summer | |
| Marcella Jeandeau | Italy | 1948 Summer | |
| René Jeandel | France | Cross country skiing, Nordic combined | 1948 Winter | |
| Walter Jeandel | 1948 Winter | |
| Édouard Jeandet | Rowing | 1928 Summer | |
| Louis Jeandet | 1928 Summer | |
| Oscar Jeanfavre | Switzerland | Artistic gymnastics | 1900 Summer | |
| Émile Jean-Fontaine | France | Sailing | 1900 Summer | |
| Robert Jeangerard | United States | Basketball | 1956 Summer | |
| Anthony Jeanjean | France | Cycling BMX freestyle | 2020 Summer, 2024 Summer | |
| Jimmy Jean-Joseph | Athletics | 1996 Summer | |
| Ivan Jean-Marie | Saint Lucia | 1996 Summer | |
| François Jeanne | France | Fencing | 1968 Summer, 1972 Summer, 1976 Summer | |
| Roland Jeannerod | Cross country skiing | 1972 Winter, 1976 Winter | |
| Fabrice Jeannet | Fencing | 2004 Summer, 2008 Summer | |
| Guillaume Jeannet | Rowing | 2000 Summer | |
| Jérôme Jeannet | Fencing | 2004 Summer, 2008 Summer | |
| Sandy Jeannin | Switzerland | Ice hockey | 2002 Winter, 2006 Winter, 2010 Winter | |
| Philippe Jeannol | France | Football | 1984 Summer | |
| Marie-Josephe Jean-Pierre | Mauritius | Badminton | 1996 Summer | |
| Claude Jean-Prost | France | Ski jumping | 1960 Winter | |
| Nicolas Jean-Prost | 1992 Winter, 1994 Winter | |
| Constance Jeans | Great Britain | Swimming | 1920 Summer, 1924 Summer | |
| Cécile Jeanson | France | 1992 Summer, 1996 Summer, 2000 Summer | |
| Geneviève Jeanson | Canada | Road cycling | 2000 Summer | |
| Jean Jeanvoix [ Wikidata ] | France | Fencing | 1900 Summer | |
| Jean Jeavons | Great Britain | Swimming | 1972 Summer | |
| Abdel Jebahi | France | Boxing | 2000 Summer | |
| Imbert Jebbink | Netherlands | Field hockey | 1976 Summer | |
| Yassine Jebbour | Morocco | Football | 2012 Summer | |
| Christian Jebe | Norway | Sailing | 1912 Summer | |
| Philister Jebet | Kenya | Volleyball | 2004 Summer | |
| Ruth Jebet | Bahrain | Athletics | 2016 Summer | |
| Edinah Jebitok | Kenya | 2020 Summer | |
| Petra Jebram | West Germany | Artistic gymnastics | 1968 Summer | |
| Tim Jecko | United States | Swimming | 1956 Summer | |
| Roman Ječmínek | Czechoslovakia, Czech Republic | Fencing | 1992 Summer, 1996 Summer | |
| Mohamed Jedidi | Tunisia | Football | 2004 Summer | |
| Jiří Jedlička | Czech Republic | Swimming | 2008 Summer | |
| Ryszard Jedliński | Poland | Handball | 1980 Summer | |
| Mariusz Jędra | Weightlifting | 2000 Summer | |
| Daniel Jędraszko | Canoe sprint | 2000 Summer, 2004 Summer, 2008 Summer | |
| Danuta Jędrejek | Athletics | 1972 Summer | |
| Tomasz Jędrusik | 1988 Summer, 1996 Summer | |
| Dorota Jędrusińska | 2008 Summer | |
| Marcin Jędrusiński | 2004 Summer, 2008 Summer | |
| Otylia Jędrzejczak | Swimming | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer | |
| Aleksander Jędrzejewski | Art competitions | 1936 Summer | |
| Camille Jedrzejewski | France | Shooting | 2024 Summer | |
| Władysław Jędrzejewski | Poland | Boxing | 1960 Summer, 1964 Summer | |
| Cezary Jędrzycki | Rowing | 1992 Summer | |
| Jee Yong-ju | South Korea | Boxing | 1968 Summer | |
| Shamuganathan Jeevajothy | Malaysia | Field hockey | 1968 Summer | |
| Emma Jeffcoat | Australia | Triathlon | 2020 Summer | |
| Richard Jefferies | Great Britain | Canoe sprint | 2012 Summer | |
| Simon Jefferies | Rowing | 1988 Summer | |
| Joshua Jefferis | Australia | Artistic gymnastics | 2012 Summer | |
| Vaughn Jefferis | New Zealand | Equestrian eventing | 1996 Summer, 2000 Summer | |
| Charles J. Jeffers [ Wikidata ] | United States | Shooting | 1908 Summer | |
| Leslie Jeffers | Great Britain | Wrestling | 1936 Summer | |
| George Jefferson | United States | Athletics | 1932 Summer | |
| Harry Jefferson | Great Britain | Sailing | 1900 Summer | |
| Jaime Jefferson | Cuba | Athletics | 1992 Summer, 1996 Summer | |
| Richard Jefferson | United States | Basketball | 2004 Summer | |
| Thomas Jefferson | Athletics | 1984 Summer | |
| Melissa Jefferson-Wooden | 2024 Summer | |
| Gordon Jeffery | Australia | Canoe sprint | 1964 Summer, 1968 Summer, 1972 Summer | |
| Margaret Jeffery | Great Britain | Swimming | 1936 Summer | |
| Robin Jeffery | Australia | Canoe slalom | 2012 Summer | |
| Edward Jefferys | South Africa | Athletics | 1960 Summer | |
| Lauren Jeffrey | Great Britain | Cross country skiing | 1984 Winter | |
| Patrick Jeffrey | United States | Diving | 1988 Summer, 1996 Summer | |
| Rhi Jeffrey | Swimming | 2004 Summer | |
| Richard Jeffrey | Great Britain | Bobsleigh | 1948 Winter | |
| Charles Jeffreys | South Africa | Shooting | 1912 Summer | |
| Robin Jeffreys | Great Britain | Fencing | 1928 Summer | |
| Chris Jeffries | Canada | Cross country skiing | 2006 Winter | |
| Tony Jeffries | Great Britain | Boxing | 2008 Summer | |
| Toni Jeffs | New Zealand | Swimming | 1992 Summer | |
| Eneli Jefimova | Estonia | 2020 Summer, 2024 Summer | |
| Pengiran Muda Abdul Hakeem | Brunei | Shooting | 1996 Summer, 2000 Summer | |
| Vera Jeftimijades | Yugoslavia | Fencing | 1960 Summer | |
| Mani Jegathesan | Malaya, Malaysia | Athletics | 1960 Summer, 1964 Summer, 1968 Summer | |
| Alpár Jegenyés | Hungary | Handball | 1980 Summer | |
| Milan Jeger | Yugoslavia | Swimming | 1960 Summer | |
| Giorgio Jegher | Italy | Athletics | 1964 Summer | |
| Žiga Jeglič | Slovenia | Ice hockey | 2014 Winter, 2018 Winter | |
| Liam Jegou | Ireland | Canoe slalom | 2020 Summer, 2024 Summer | |
| Maurice Jéhin [ Wikidata ] | France | Equestrian jumping, Equestrian dressage | 1900 Summer | |
| Marina Jehl [ Wikidata ] | Swimming | 2024 Summer | |
| Clemens Jehle | Switzerland | Judo | 1984 Summer, 1988 Summer | |
| Erwin Jehle | Liechtenstein | Cross country skiing | 1948 Winter | |
| Joseph Jehle | Switzerland | Shooting | 1920 Summer | |
| Peter Jehle | Handball | 1980 Summer, 1984 Summer | |
| Robert Jehle | 1980 Summer | |
| Rudolf Jehle | Liechtenstein | Shooting | 1936 Summer | |
| Jaroslava Jehličková | Czechoslovakia | Athletics | 1968 Summer, 1972 Summer | |
| Théo Jeitz | Luxembourg | Artistic gymnastics | 1924 Summer | |
| Ursula Jeitziner | Switzerland | Athletics | 1996 Summer | |
| Lana Jēkabsone | Latvia | 1996 Summer | |
| Anete Jēkabsone-Žogota | Basketball | 2008 Summer | |
| Gvido Jekals | Athletics | 1924 Summer | |
| Erina Jeke | Zimbabwe | Football | 2016 Summer | |
| Michaił Jekimow [ Wikidata ] | Russia | Equestrian dressage | 1912 Summer | |
| Rudi Jeklic | Germany | Speed skating | 1992 Winter | |
| Aleksandra Zhekova | Bulgaria | Snowboarding | 2006 Winter, 2010 Winter, 2014 Winter, 2018 Winter | |
| Dejan Jekovec | Slovenia | Ski jumping | 1994 Winter | |
| Tatjana Jelača | Serbia | Athletics | 2008 Summer, 2012 Summer | |
| Irene Jelagat | Kenya | 2008 Summer | |
| Davor Jelaska | Yugoslavia | Rowing | 1936 Summer | |
| Nesria Jelassi | Tunisia | Judo | 2008 Summer | |
| Anđa Jelavić | Croatia | Basketball | 2012 Summer | |
| George Jelbart | Australia | Rowing | 2004 Summer | |
| Kerry Jelbart | 1972 Summer | |
| Kim Jelbart | 1960 Summer | |
| Ivana Jelčić | Croatia | Handball | 2012 Summer | |
| Vladimir Jelčić | 1996 Summer | |
| Lydia Jele | Botswana | Athletics | 2016 Summer | |
| Nicolas Jeleff | France | Water polo | 1988 Summer, 1992 Summer | |
| Eric Jelen | West Germany | Tennis | 1988 Summer | |
| Josef Jelen | Czechoslovakia | Boxing | 1936 Summer | |
| Rudolf Jelen | Shooting | 1920 Summer, 1924 Summer | |
| Maksi Jelenc | Yugoslavia | Cross country skiing | 1976 Winter | |
| Zoltán Jelenffy [ Wikidata ] | Hungary | Shooting | 1912 Summer | |
| Viktor Jelenić | Serbia and Montenegro | Water polo | 1996 Summer, 2000 Summer, 2004 Summer | |
| Marjan Jelenko | Slovenia | Nordic combined | 2014 Winter, 2018 Winter | |
| Nikolay Jeliazkov | Bulgaria | Volleyball | 1996 Summer | |
| Drago Jelić | Yugoslavia | Artistic gymnastics | 1948 Summer | |
| Ivica Jelić | 1948 Summer, 1952 Summer | |
| Ivica Jelić | Volleyball | 1980 Summer | |
| Matea Jelić | Croatia | Taekwondo | 2020 Summer | |
| Vesna Jelić | Volleyball | 2000 Summer | |
| Barbara Jelić-Ružić | 2000 Summer | |
| Mohamed Naceur Jelili | Tunisia | Handball | 1972 Summer, 1976 Summer | |
| Mounir Jelili | 1972 Summer, 1976 Summer | |
| Pamela Jelimo | Kenya | Athletics | 2008 Summer, 2012 Summer | |
| Antonín Jelínek | Czechoslovakia | Wrestling | 1980 Summer | |
| David Jelínek | Czech Republic | Basketball | 2020 Summer | |
| Josef Jelínek | Czechoslovakia | Football | 1924 Summer | |
| Maria Jelinek | Canada | Figure skating | 1960 Winter | |
| Miloš Jelínek | Czechoslovakia | Track cycling | 1968 Summer | |
| Otto Jelinek | Canada | Figure skating | 1960 Winter | |
| Rolf Jelinek | Switzerland | Athletics | 1964 Summer | |
| Sid Jelinek | United States | Rowing | 1924 Summer | |
| Tomáš Jelínek | Czechoslovakia | Ice hockey | 1992 Winter | |
| Adriana Jelínková | Netherlands | Alpine skiing | 2022 Winter | |
| Dora Jelínková | Czechoslovakia | Volleyball | 1972 Summer | |
| Martyna Jelińska | Poland | Fencing | 2020 Summer, 2024 Summer | |
| Michał Jeliński | Rowing | 2004 Summer, 2008 Summer, 2012 Summer | |
| Nikolajs Jeļisejevs | Latvia | Ice hockey | 2022 Winter | |
| Poļina Jeļizarova | Athletics | 2012 Summer | |
| Mainie Jellett | Ireland | Art competitions | 1928 Summer | |
| John Jellico | Great Britain | Sailing | 1908 Summer | |
| Martin Jellinghaus | West Germany | Athletics | 1968 Summer, 1972 Summer | |
| Martin Jellinghaus | Water polo | 1976 Summer | |
| Adil Jelloul | Morocco | Road cycling | 2012 Summer | |
| Mehdi Jelodarzadeh | Iran | Athletics | 2000 Summer | |
| Gregor Jelonek | Canada | Speed skating | 1988 Winter | |
| Jakub Jelonek | Poland | Athletics | 2008 Summer, 2016 Summer | |
| Vinko Jelovac | Yugoslavia | Basketball | 1972 Summer, 1976 Summer | |
| Jerzy Jełowicki | Poland | Art competitions | 1936 Summer | |
| Alexander Jeltkov | Canada | Artistic gymnastics | 2000 Summer, 2004 Summer | |
| Ana Jelušić Black | Croatia | Alpine skiing | 2002 Winter, 2006 Winter, 2010 Winter | |
| Salim Jemai | Tunisia | Canoe slalom | 2024 Summer | |
| Yelena Jemayeva | Azerbaijan | Fencing | 2004 Summer | |
| Božo Jemc | Yugoslavia | Ski jumping | 1964 Winter | |
| Tomaž Jemc | Alpine skiing | 1984 Winter | |
| Marko Jemec | Slovenia | Freestyle skiing | 1992 Winter | |
| Miroslav Jemelka | Czechoslovakia | Canoe sprint | 1956 Summer | |
| Otto Jemelka | Modern pentathlon | 1948 Summer | |
| Kishore Jena | India | Athletics | 2024 Summer | |
| Ernst Jencquel | Germany | Rowing | 1900 Summer | |
| Nora Jenčušová | Slovakia | Road cycling | 2024 Summer | |
| Ján Jendek | Czechoslovakia | Ice hockey | 1956 Winter | |
| Mohamed Khalil Jendoubi | Tunisia | Taekwondo | 2020 Summer, 2024 Summer | |
| Megan Jendrick | United States | Swimming | 2000 Summer, 2008 Summer | |
| Jeffrey Jendryk | Volleyball | 2024 Summer | |
| Dezideriu Jenei | Romania | Speed skating | 1980 Winter, 1984 Winter | |
| Emerich Jenei | Football | 1964 Summer | |
| István Jenei | Hungary | Shooting | 1972 Summer | |
| István Jeney [ Wikidata ] | Rowing | 1912 Summer | |
| László Jeney | Water polo | 1948 Summer, 1952 Summer, 1956 Summer, 1960 Summer | |
| Zoltán Jeney | Ice hockey | 1936 Winter | |
| Paul Jenft | France | Sport climbing | 2024 Summer | |
| Alhaji Jeng | Sweden | Athletics | 2008 Summer, 2012 Summer | |
| Albert Jenicot | France | Football | 1908 Summer | |
| Jaruwan Jenjudkarn | Thailand | Athletics | 1992 Summer | |
| Brian Jenkins | Great Britain | Swimming | 1964 Summer | |
| Charles Jenkins Jr. | United States | Athletics | 1992 Summer | |
| Charles Jenkins Sr. | 1956 Summer | |
| Colin Jenkins | Canada | Triathlon | 2008 Summer | |
| David Jenkins | United States | Figure skating | 1956 Winter, 1960 Winter | |
| David Jenkins | Great Britain | Athletics | 1972 Summer, 1976 Summer, 1980 Summer | |
| Ed Jenkins | Australia | Rugby sevens | 2016 Summer | |
| Enoch Jenkins | Great Britain | Shooting | 1920 Summer, 1924 Summer, 1952 Summer | |
| Hayes Alan Jenkins | United States | Figure skating | 1952 Winter, 1956 Winter | |
| Helen Jenkins | Great Britain | Triathlon | 2008 Summer, 2012 Summer, 2016 Summer | |
| Ian Jenkins | Figure skating | 1984 Winter | |
| John Jenkins | 1994 Winter | |
| Julie Jenkins | United States | Athletics | 1992 Summer | |
| Malcolm Jenkins | Great Britain | Shooting | 1976 Summer | |
| Marc Jenkins | Triathlon | 2004 Summer | |
| Margaret Jenkins | United States | Athletics | 1928 Summer, 1932 Summer | |
| Niki Jenkins | Canada | Judo | 1996 Summer | |
| Sam Jenkins | New Zealand | Football | 2008 Summer | |
| Sandra Jenkins | Canada | Curling | 2006 Winter | |
| Tamara Jenkins | United States | Canoe sprint | 2000 Summer | |
| Tammy Jenkins | New Zealand | Badminton | 1992 Summer, 1996 Summer | |
| Toby Jenkins | Australia | Water polo | 2004 Summer | |
| Tovea Jenkins | Jamaica | Athletics | 2020 Summer | |
| Alan Jenkinson | Australia | Boxing | 1972 Summer | |
| John Jenkinson | Rowing | 1956 Summer | |
| Natalie Jenkinson | Judo | 2000 Summer | |
| Robert Jenkinson | New Zealand | Canoe sprint | 1984 Summer | |
| Eldon Jenne | United States | Athletics | 1920 Summer | |
| Michelle Jenneke | Australia | 2016 Summer, 2024 Summer | |
| David Jennens | Great Britain | Rowing | 1952 Summer | |
| Brianne Jenner | Canada | Ice hockey | 2014 Winter, 2018 Winter, 2022 Winter | |
| Caitlyn Jenner | United States | Athletics | 1972 Summer, 1976 Summer | |
| Christopher Jenner | New Zealand | Road cycling | 2000 Summer | |
| Elizabeth Jenner | Great Britain | Athletics | 1960 Summer | |
| Kate Jenner | Australia | Field hockey | 2012 Summer, 2020 Summer | |
| Sue Jenner | Great Britain | Swimming | 1976 Summer | |
| Lindsay Jennerich | Canada | Rowing | 2012 Summer, 2016 Summer | |
| Stephen Jenness | New Zealand | Field hockey | 2012 Summer, 2016 Summer, 2020 Summer | |
| Heinz Jenni | Switzerland | Ice hockey | 1972 Winter | |
| Jean Jenni | Swimming, Water polo | 1920 Summer | |
| Marcel Jenni | Ice hockey | 2002 Winter, 2006 Winter | |
| Oskar Jenni | 1964 Winter | |
| Athol Jennings | South Africa | Athletics | 1952 Summer | |
| Caitriona Jennings | Ireland | 2012 Summer | |
| Devereaux Jennings | United States | Alpine skiing | 1948 Winter | |
| Edward Jennings | Rowing | 1924 Summer, 1932 Summer | |
| Gabe Jennings | Athletics | 2000 Summer | |
| Gary Jennings | Great Britain | 1996 Summer | |
| Graeme Jennings | Australia | Fencing | 1968 Summer | |
| Graham Jennings | Football | 1988 Summer | |
| Joanne Jennings | Great Britain | Athletics | 1988 Summer, 1992 Summer | |
| Lynn Jennings | United States | 1988 Summer, 1992 Summer, 1996 Summer | |
| Paul Jennings | Great Britain | Track cycling | 1992 Summer | |
| Steve Jennings | United States | Field hockey | 1996 Summer | |
| Terrence Jennings | Taekwondo | 2012 Summer | |
| Carin Jennings-Gabarra | Football | 1996 Summer | |
| Tim Jenniskens | Netherlands | Field hockey | 2012 Summer | |
| Melissa Jennison | Australia | Archery | 2000 Summer, 2004 Summer | |
| Charles Jenny | Switzerland | Bobsleigh | 1932 Winter | |
| Fred Jenny | Field hockey | 1928 Summer | |
| Grete Jenny | Austria | Athletics | 1948 Summer | |
| Ladina Jenny | Switzerland | Snowboarding | 2014 Winter, 2018 Winter, 2022 Winter | |
| Olivier Jenot | Monaco | Alpine skiing | 2006 Winter, 2014 Winter, 2018 Winter | |
| João Jens | Brazil | Volleyball | 1968 Summer, 1972 Summer | |
| Willem Jens | Netherlands | Rowing | 1936 Summer | |
| Olga Jensch-Jordan | Germany | Diving | 1932 Summer, 1936 Summer | |
| Aage Jensen | Denmark | Rowing | 1936 Summer | |
| Angelina Jensen | Curling | 2010 Winter | |
| Anne Grethe Jensen | Equestrian dressage | 1984 Summer, 1988 Summer, 1992 Summer | |
| Annemette Jensen | Athletics | 2004 Summer | |
| Arne Jensen | Tonga | Archery | 2016 Summer | |
| Arne Preben Jensen | Denmark | Equestrian eventing | 1960 Summer | |
| Axel Jensen | Athletics | 1920 Summer, 1924 Summer | |
| Barbara Jensen | United States | Swimming | 1948 Summer | |
| Benny Jensen | Denmark | Shooting | 1968 Summer | |
| Bent Jensen | Rowing | 1952 Summer | |
| Bent Jensen | Equestrian dressage | 1992 Summer | |
| Bernhard Jensen | Canoe sprint | 1948 Summer | |
| Birgit Jensen | 1960 Summer | |
| Bjørg Eva Jensen | Norway | Speed skating | 1980 Winter, 1984 Winter | |
| Bo Jensen | Denmark | Curling | 2010 Winter | |
| Børge Jensen | Wrestling | 1932 Summer | |
| Camilla Jensen | Curling | 2010 Winter | |
| Carl Jensen | Wrestling | 1908 Summer | |
| Carl Jensen | Boxing | 1932 Summer | |
| Carsten Jensen | Judo | 1984 Summer | |
| Charles Jensen | Artistic gymnastics | 1908 Summer, 1912 Summer | |
| Christian Jensen | Weightlifting | 1920 Summer | |
| Christine Bøe Jensen | Norway | Football | 2000 Summer | |
| David Jensen | United States | Ice hockey | 1984 Winter | |
| David Jensen | 1984 Winter | |
| Dennis Otzen Jensen | Denmark | Swimming | 2000 Summer | |
| Ditte Jensen | 1996 Summer | |
| Dorte Jensen | Sailing | 1992 Summer, 2004 Summer | |
| Edvin Jensen | Wrestling | 1920 Summer | |
| Einer Jensen | Boxing | 1920 Summer | |
| Ejnar Jensen | Weightlifting | 1920 Summer | |
| Elaine Jensen | New Zealand | Field hockey | 1992 Summer | |
| Emil Boje Jensen | Denmark | Rowing | 1936 Summer | |
| Erik Jensen | Boxing | 1948 Summer | |
| Erik Jensen | Athletics | 1988 Summer | |
| Erling Jensen | Norway | Artistic gymnastics | 1912 Summer | |
| Ernst Friborg Jensen | Denmark | Rowing | 1928 Summer | |
| Finn Jensen | Swimming | 1936 Summer | |
| Flemming Jensen | Rowing | 1936 Summer | |
| Frank Høj Jensen | Sailing | 1972 Summer | |
| Freddy Jensen | Artistic gymnastics | 1948 Summer, 1952 Summer | |
| Gitta Jensen | Swimming | 1988 Summer, 1992 Summer | |
| Gorm Jensen | Artistic gymnastics | 1908 Summer | |
| Hans Petter Jensen | Norway | Sailing | 1976 Summer | |
| Harald Jensen | Shooting | 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer, 2008 Summer | |
| Heike Jensen | East Germany | Volleyball | 1988 Summer | |
| Helge Jensen | Denmark | Modern pentathlon | 1924 Summer, 1928 Summer | |
| Helle Jensen | Football | 1996 Summer | |
| Iain Jensen | Australia | Sailing | 2012 Summer, 2016 Summer | |
| Ingemann Bylling Jensen | Denmark | 1952 Summer | |
| Ivan Jensen | Football | 1948 Summer | |
| Jakob Precht Jensen | Sailing | 2020 Summer | |
| Jens Berendt Jensen | Rowing | 1960 Summer, 1964 Summer | |
| Jens Kristian Jensen | Artistic gymnastics | 1912 Summer | |
| Jesper Jensen | Boxing | 1992 Summer | |
| Jesper Jensen | Handball | 2008 Summer | |
| Jesper Jensen Aabo | Ice hockey | 2022 Winter | |
| Jesper Jensen | 2022 Winter | |
| Johan Jensen | Boxing | 1920 Summer | |
| Johannes Robert Jensen | Field hockey | 1936 Summer, 1948 Summer | |
| John Erik Jensen | Rowing | 1968 Summer | |
| Jørgen Jensen | Wrestling | 1960 Summer, 1964 Summer | |
| Jørgen Jensen | Track cycling | 1968 Summer | |
| Jørgen Jensen | Athletics | 1972 Summer, 1976 Summer | |
| Jørgen Martinius Jensen | Norway | Equestrian jumping | 1912 Summer | |
| Julie Brendengen Jensen | Freestyle skiing | 2010 Winter | |
| Julie Kepp Jensen | Denmark | Swimming | 2016 Summer, 2020 Summer, 2024 Summer | |
| Kai Jensen | Athletics | 1924 Summer | |
| Karl Jensen | 1924 Summer | |
| Karl Julius Jensen [ Wikidata ] | 1912 Summer | |
| Karl-Einar Jensen | Norway | Sailing | 1988 Summer | |
| Kirsten Hedegaard Jensen | Denmark | Swimming | 1952 Summer | |
| Kirsten Plum Jensen | Rowing | 1976 Summer | |
| Klaus Jensen | Handball | 1984 Summer | |
| Klaus Føge Jensen | Sailing | 1972 Summer | |
| Knud Bruun Jensen | Rowing | 1952 Summer | |
| Kristian Jensen | Equestrian dressage | 1952 Summer | |
| Lars Jensen | Road cycling | 1984 Summer | |
| Lars Kraus Jensen | Swimming | 1964 Summer, 1968 Summer | |
| Larsen Jensen | United States | 2004 Summer, 2008 Summer | |
| Line Jensen | Denmark | Triathlon | 2012 Summer | |
| Lisa Jensen | Ice hockey | 2022 Winter | |
| Lorents Jensen | Shooting | 1908 Summer | |
| Marcus Jensen | United States | Baseball | 2000 Summer | |
| Mark Jensen | Canada | Luge | 1980 Winter | |
| Merethe Jensen | Denmark | Equestrian jumping | 1992 Summer | |
| Mogens Jensen | Rowing | 1960 Summer | |
| Morten Jensen | Norway | Sailing | 1976 Summer | |
| Morten Jensen | Denmark | Athletics | 2008 Summer | |
| Nicholas Jensen | Ice hockey | 2022 Winter | |
| Nicklas Jensen | 2022 Winter | |
| Nicoline Jensen | 2022 Winter | |
| Niels Jensen | Sailing | 1968 Summer | |
| Oddmund Jensen | Norway | Cross country skiing | 1956 Winter, 1960 Winter | |
| Øivind Jensen | Boxing | 1924 Summer | |
| Ole Jensen | Shooting | 1912 Summer | |
| Ole Bloch Jensen | Denmark | Rowing | 1980 Summer | |
| Ole David Jensen | Athletics | 1972 Summer | |
| Ole Hviid Jensen | Shooting | 1956 Summer, 1964 Summer, 1968 Summer | |
| Ole Scavenius Jensen | Rowing | 1952 Summer | |
| Otto Jensen | Road cycling | 1912 Summer | |
| Ove Jensen | 1972 Summer | |
| Palle Jensen | Handball | 1976 Summer, 1980 Summer | |
| Paul Jensen | United States | Ice hockey | 1976 Winter | |
| Peder Jensen | Denmark | Equestrian eventing, Equestrian dressage | 1928 Summer, 1936 Summer | |
| Pernille Jensen | Swimming | 1988 Summer | |
| Peter Jensen [ Wikidata ] | Trampolining | 2004 Summer, 2008 Summer, 2012 Summer | |
| Peter Aagaard Jensen | Shooting | 1988 Summer | |
| Poul Jensen | Football | 1960 Summer | |
| Poul Richard Høj Jensen | Sailing | 1968 Summer, 1972 Summer, 1976 Summer, 1980 Summer | |
| Preben Jensen | Canoe sprint | 1964 Summer | |
| Scarlett Mew Jensen | Great Britain | Diving | 2020 Summer, 2024 Summer | |
| Sid Jensen | Canada | Artistic gymnastics | 1968 Summer | |
| Søren Jensen | Denmark | Rowing | 1948 Summer | |
| Sophia Jensen | Canada | Canoe sprint | 2024 Summer | |
| Sophus Jensen | United States | Water polo | 1920 Summer | |
| Søren Jensen | Denmark | Handball | 1972 Summer | |
| Søren Alfred Jensen | Artistic gymnastics | 1912 Summer | |
| Søren Marinus Jensen | Wrestling | 1908 Summer, 1912 Summer | |
| Steve Jensen | United States | Ice hockey | 1976 Winter | |
| Sverre Jensen | Norway | Football | 1912 Summer | |
| Thor Jensen | Artistic gymnastics | 1912 Summer | |
| Tonny Jensen | Denmark | Equestrian dressage | 1976 Summer | |
| Tonny Jensen | Australia | Basketball | 1996 Summer | |
| Torben Alstrup Jensen | Denmark | Field hockey | 1960 Summer | |
| Valther Jensen | Athletics | 1920 Summer | |
| Viggo Jensen | Athletics, Artistic gymnastics, Shooting, Weightlifting | 1896 Summer, 1900 Summer | |
| Viggo Jensen | Football | 1948 Summer | |
| Jessika Jenson | United States | Snowboarding | 2014 Winter, 2018 Winter | |
| Leif Jenssen | Norway | Weightlifting | 1968 Summer, 1972 Summer, 1976 Summer | |
| Lene Jenssen | Swimming | 1976 Summer | |
| Olav Jenssen | Athletics | 1992 Summer | |
| Þorbjörn Jensson | Iceland | Handball | 1984 Summer | |
| Leon Jensz | Poland | Sailing | 1936 Summer | |
| Fred Jent | Switzerland | Art competitions | 1936 Summer | |
| Martina Jentsch | East Germany | Artistic gymnastics | 1988 Summer | |
| Rudolf Jeny | Hungary | Football | 1924 Summer | |
| Ronald Jenyns | Australia | Sailing | 1960 Summer, 1968 Summer | |
| Roland Jenzer | Switzerland | Field hockey | 1948 Summer | |
| Jeon Chan-sik | South Korea | Shooting | 2000 Summer | |
| Jeon Da-hye | Short track speed skating | 2006 Winter | |
| Jeon Eun-hye | Fencing | 2024 Summer | |
| Jeon Hae-sup | Wrestling | 1976 Summer | |
| Jeon Ha-young | Fencing | 2024 Summer | |
| Jeon Hee-sook | 2012 Summer, 2016 Summer, 2020 Summer | |
| Jeon Hong-kwon | Field hockey | 2000 Summer | |
| Jeon Hyeok-jin | Badminton | 2024 Summer | |
| Jeon Jae-won | Biathlon | 1998 Winter | |
| Jeon Ji-hee | Table tennis | 2016 Summer, 2020 Summer, 2024 Summer | |
| Jeon Jong-ha | Field hockey | 1996 Summer, 2000 Summer, 2004 Summer | |
| Jeon Jung-woo | Ice hockey | 2018 Winter | |
| Jeon Ki-young | Judo | 1996 Summer | |
| Jeon Ok-ja | Swimming | 1964 Summer | |
| Jeon Sang-guen | Weightlifting | 2008 Summer, 2012 Summer | |
| Jeon Seon-ok | Speed skating | 1972 Winter | |
| Jeon Yeong-eun | Athletics | 2012 Summer, 2016 Summer | |
| Jeon Young-sun | Field hockey | 1996 Summer | |
| Jeon Yu-mi | 2012 Summer | |
| Jeong Bae-yeong | Speed skating | 1994 Winter | |
| Jeong Bo-kyeong | Judo | 2016 Summer | |
| Jeong Bong-sun | Artistic gymnastics | 1964 Summer | |
| Jeong Bu-jin | Field hockey | 1988 Summer | |
| Jeong Chung-gu | Speed skating | 1972 Winter | |
| Jeong Da-rae | Swimming | 2008 Summer, 2012 Summer | |
| Jeong Doo-hee | 2004 Summer | |
| Jeong Gi-seon | Athletics | 1964 Summer | |
| Jeong Gyeong-hun | Modern pentathlon | 1984 Summer | |
| Jeong Gyeong-mi | Judo | 2008 Summer, 2012 Summer | |
| Jeong Gye-seok | Field hockey | 1988 Summer | |
| Jeong Hae-rim | Snowboarding | 2018 Winter, 2022 Winter | |
| Jeong Han | Handball | 2012 Summer | |
| Jeong Hang-ju | Field hockey | 2000 Summer | |
| Jeong Hye-jeong | Rowing | 2020 Summer | |
| Jeong Hyoi-soon | Handball | 1984 Summer | |
| Jeong Jae-won | Rowing | 1988 Summer | |
| Jeong Jeong-eun | Volleyball | 1964 Summer | |
| Jeong Jin-bong | Basketball | 1964 Summer | |
| Jeong Jin-hui | Handball | 2020 Summer, 2024 Summer | |
| Jeong Jin-hyeok | Athletics | 2012 Summer | |
| Jeong Jin-uk | Speed skating | 1998 Winter | |
| Jeong Ji-yun | Volleyball | 2020 Summer | |
| Jeong Keun-woo | Baseball | 2008 Summer | |
| Jeong Mi | Canoe sprint | 1988 Summer | |
| Jeong Mi-ja | Athletics | 1988 Summer | |
| Jeong Mi-kyeong | Basketball | 1988 Summer | |
| Jeong Mi-ra | Shooting | 2012 Summer | |
| Jeong Myung-hee | Basketball | 1984 Summer | |
| Jeong Na-eun | Badminton | 2024 Summer | |
| Jeong Nam-gyun | Athletics | 2000 Summer | |
| Jeong On-ra | Swimming | 1996 Summer | |
| Jeong Pil-hwa | Athletics | 1988 Summer | |
| Jeong Ri-gwang | Artistic gymnastics | 1964 Summer | |
| Jeong Seung-won | Football | 2020 Summer | |
| Jeong Seung-won | Boxing | 1992 Summer | |
| Jeong Sophia | Skeleton | 2018 Winter | |
| Jeong Sun-ja | Diving | 1964 Summer | |
| Jeong Tae-wook | Football | 2020 Summer | |
| Jeong Yeon-sik | Rugby sevens | 2020 Summer | |
| Jeong Yi-kyeong | Handball | 2008 Summer, 2012 Summer | |
| Jeong Yong-gyun | Field hockey | 1996 Summer | |
| Jeong Yun-ok | Wrestling | 1976 Summer | |
| Choi Jeong-ryong | Shooting | 1984 Summer | |
| Choi Jeong-Yun [ Wikidata ] | Artistic swimming | 1988 Summer | |
| Jeoung Young-sik | Table tennis | 2016 Summer, 2020 Summer | |
| Peres Jepchirchir | Kenya | Athletics | 2020 Summer, 2024 Summer | |
| Daisy Jepkemei | Kazakhstan | 2024 Summer | |
| Hyvin Jepkemoi | Kenya | 2016 Summer, 2020 Summer | |
| Visiline Jepkesho | 2016 Summer | |
| Pamela Jepkirui | Volleyball | 2020 Summer | |
| Eunice Jepkorir | Athletics | 2008 Summer | |
| Janeth Jepkosgei | 2008 Summer, 2012 Summer | |
| Nelly Jepkosgei | Bahrain | 2024 Summer | |
| Harold Jeppe | South Africa | 1920 Summer | |
| Anne Grethe Jeppesen | Norway | Shooting | 1984 Summer | |
| Bjarne Jeppesen | Denmark | Handball | 1980 Summer | |
| Jette Jeppesen | Athletics | 1996 Summer | |
| Mogens Jeppesen | Handball | 1980 Summer, 1984 Summer | |
| Börje Jeppson | Sweden | Equestrian jumping | 1952 Summer | |
| Börje Jeppsson | Weightlifting | 1952 Summer | |
| Kevin Jepsen | United States | Baseball | 2008 Summer | |
| Priscah Jeptoo | Kenya | Athletics | 2012 Summer | |
| Susan Jeptooo Kipsang | France | 2020 Summer | |
| Jakub Jeřábek | Czech Republic | Ice hockey | 2022 Winter | |
| Jaroslav Jeřábek | Czechoslovakia, Slovakia | Track cycling | 1992 Summer, 2000 Summer, 2004 Summer | |
| Tomáš Jeřábek | Czech Republic | Shooting | 2004 Summer, 2008 Summer | |
| Martina Jerant | Canada | Basketball | 1996 Summer | |
| Sašo Jereb | Slovenia | Judo | 2004 Summer | |
| Žana Jereb | Athletics | 2012 Summer | |
| Bruno Jerebicnik | Austria | Modern pentathlon | 1972 Summer | |
| Jerry Jeremiah | Vanuatu | Athletics | 1988 Summer | |
| Slavica Jeremić | Yugoslavia | Handball | 1980 Summer | |
| Daniel Jérent | France | Fencing | 2016 Summer | |
| Caridad Jerez | Spain | Athletics | 2016 Summer | |
| Ricardo Jérez | Guatemala | Football | 1988 Summer | |
| Vinka Jeričević | Yugoslavia | Swimming | 1956 Summer | |
| Květa Jeriová | Czechoslovakia | Cross country skiing | 1980 Winter, 1984 Winter | |
| Markéta Jeriová | Czech Republic | Luge | 2002 Winter, 2006 Winter | |
| Željko Jerkov | Yugoslavia | Basketball | 1976 Summer, 1980 Summer | |
| Andrej Jerman | Slovenia | Alpine skiing | 2002 Winter, 2006 Winter, 2010 Winter | |
| Francisco Jerman | Argentina | Cross country skiing | 1960 Winter | |
| Marcos Luis Jerman | 1976 Winter, 1980 Winter | |
| Martín Tomás Jerman | 1976 Winter, 1980 Winter | |
| Matías José Jerman | 1976 Winter, 1980 Winter | |
| Metka Jerman | Yugoslavia | Alpine skiing | 1980 Winter | |
| Charles Jermann | Switzerland | Shooting | 1976 Summer | |
| Joseph Jermia | Namibia | Boxing | 2004 Summer | |
| John Jermyn | Ireland | Field hockey | 2016 Summer | |
| Ingemar Jernberg | Sweden | Athletics | 1972 Summer, 1976 Summer | |
| Sixten Jernberg | Cross country skiing | 1956 Winter, 1960 Winter, 1964 Winter | |
| Magnus Jernemyr | Handball | 2012 Summer | |
| Billy Jernigan | United States | Wrestling | 1948 Summer | |
| Werner Jernström | Sweden | Shooting | 1912 Summer, 1920 Summer | |
| Diane Jerome | United States | Canoe sprint | 1960 Summer | |
| Harry Jerome | Canada | Athletics | 1960 Summer, 1964 Summer, 1968 Summer | |
| Jessica Jerome | United States | Ski jumping | 2014 Winter | |
| Ulunma Jerome | Nigeria | Football | 2008 Summer | |
| Valerie Jerome | Canada | Athletics | 1960 Summer | |
| Erick Jerônimo [ Wikidata ] | Brazil | Bobsleigh | 2022 Winter | |
| Makrem Jerou | Tunisia | Handball | 2000 Summer | |
| Jerry [ Wikidata ] | Czechoslovakia | Art competitions | 1936 Summer | |
| Birgit Jerschabek | Germany | Athletics | 1992 Summer | |
| Norah Jeruto | Kazakhstan | 2024 Summer | |
| Marisa Jervella | Switzerland | Artistic gymnastics | 1984 Summer | |
| Gunnar Jervill | Sweden | Archery | 1972 Summer, 1976 Summer | |
| Daniel Jervis | Great Britain | Swimming | 2020 Summer, 2024 Summer | |
| Leonard Jervis | Bahamas | Athletics | 1976 Summer | |
| Frank Jerwood | Great Britain | Rowing | 1908 Summer | |
| Nia Jerwood | Australia | Sailing | 2020 Summer, 2024 Summer | |
| Agnieszka Jerzyk | Poland | Triathlon | 2012 Summer, 2016 Summer | |
| Jackie Jeschelnig | United States | Athletics | 2004 Summer | |
| Marta Jeschke | Poland | 2008 Summer, 2012 Summer | |
| Norman Jeschke | Germany | Figure skating | 2002 Winter | |
| Jiří Jesenský | Czechoslovakia | Fencing | 1936 Summer | |
| Anna Jesień | Poland | Athletics | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer | |
| Ferenc Jesina | Hungary | 1908 Summer | |
| Walther Jesinghaus | Germany | Artistic gymnastics | 1912 Summer | |
| Celina Jesionowska | Poland | Athletics | 1960 Summer | |
| Chris Jespersen | Norway | Cross country skiing | 2014 Winter | |
| Eric Jespersen | Canada | Sailing | 1992 Summer, 1996 Summer | |
| Helle Jespersen | Denmark | 2004 Summer | |
| Per Mathias Jespersen | Norway | Artistic gymnastics | 1908 Summer | |
| Alfonso Jessel | Mexico | Wrestling | 1988 Summer | |
| David Jessen | Czech Republic | Artistic gymnastics | 2016 Summer, 2020 Summer | |
| Erling Jessen | Denmark | Canoe sprint | 1960 Summer | |
| Michael Jessen | Rowing | 1980 Summer, 1984 Summer | |
| Poul Jessen | Artistic gymnastics | 1948 Summer, 1952 Summer | |
| Fred Jessey | Nigeria | Wrestling | 2004 Summer | |
| Gianluigi Jessi | Italy | Basketball | 1968 Summer | |
| Joseph Jessop | United States | Sailing | 1932 Summer | |
| George Jessup [ Wikidata ] | Great Britain | Boxing | 1908 Summer | |
| Paul Jessup | United States | Athletics | 1932 Summer | |
| Richard Jessup | Sailing | 1948 Summer | |
| Realdo Jessurun | Suriname | Road cycling, Track cycling | 1988 Summer, 1992 Summer | |
| Nikola Jestratijević | Serbia and Montenegro | Basketball | 2000 Summer | |
| Janet Jesudason | Singapore | Athletics | 1956 Summer | |
| Mélanie de Jesus dos Santos | France | Artistic gymnastics | 2020 Summer, 2024 Summer | |
| Albino de Jesus | Portugal | Shooting | 1952 Summer | |
| Angel de Jesús | Venezuela | Football | 1980 Summer | |
| Francisco de Jesus | Brazil | Boxing | 1976 Summer, 1980 Summer | |
| Gabriel Jesus | Football | 2016 Summer | |
| Helder Baiona de Jesus | Portugal | Athletics | 1976 Summer | |
| John de Jesús | Puerto Rico | Wrestling | 1976 Summer | |
| José-Ricardo de Jesús | Swimming | 1976 Summer | |
| Luís Jesus | Portugal | Athletics | 1996 Summer | |
| Madeline de Jesús | Puerto Rico | 1984 Summer, 1988 Summer | |
| Margaret de Jesús | 1984 Summer | |
| Nivalter Jesus | Brazil | Canoe sprint | 2008 Summer | |
| Ovidio de Jesús | Puerto Rico | Athletics | 1956 Summer, 1960 Summer | |
| Reinier Jesus | Brazil | Football | 2020 Summer | |
| Robenílson de Jesus | Boxing | 2008 Summer, 2012 Summer, 2016 Summer | |
| László Jeszenszky | Hungary | Athletics | 1952 Summer, 1956 Summer | |
| Carmelita Jeter | United States | 2012 Summer | |
| Thomas Jeter | Fencing | 1924 Summer | |
| James Jett | Athletics | 1992 Summer | |
| Yves Jeudy | Haiti | Boxing | 1976 Summer | |
| Pascale Jeuland | France | Track cycling | 2008 Summer | |
| Jeung Soon-bok | South Korea | Handball | 1984 Summer | |
| Erling Jevne | Norway | Cross country skiing | 1992 Winter, 1994 Winter, 1998 Winter, 2002 Winter | |
| Olivera Jevtić | Serbia and Montenegro, Serbia | Athletics | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer, 2016 Summer | |
| Živorad Jevtić | Yugoslavia | Football | 1964 Summer | |
| Marko Jevtović | Serbia | Table tennis | 2012 Summer, 2020 Summer | |
| Liam Jewell | Canada | Canoe sprint | 1996 Summer | |
| Lynne Jewell | United States | Sailing | 1988 Summer | |
| Tyler Jewell | Snowboarding | 2006 Winter, 2010 Winter | |
| Wanda Jewell | Shooting | 1984 Summer, 1988 Summer | |
| William Jewell | Canoe sprint | 1964 Summer | |
| Frank Jewett | Sailing | 1936 Summer | |
| Gordon Jewett | Canada | Cross country skiing | 2010 Winter | |
| Isaiah Jewett | United States | Athletics | 2020 Summer | |
| Kenneth Jewett | Boxing | 1904 Summer | |
| Charles Jewtraw | Speed skating | 1924 Winter | |
| Sonya Jeyaseelan | Canada | Tennis | 2000 Summer | |
| S. Jeyathurai | Singapore | Field hockey | 1956 Summer | |
| František Jež | Czechoslovakia, Czech Republic | Ski jumping | 1992 Winter, 1998 Winter | |
| Jadranka Jez | Austria | Handball | 1992 Summer | |
| Jerzy Jeż | Poland | Canoe slalom | 1972 Summer | |
| Marian Jeżak | Ice hockey | 1952 Winter | |
| Jaromír Ježek | Czech Republic | Judo | 2008 Summer, 2012 Summer, 2016 Summer | |
| Linda Jezek | United States | Swimming | 1976 Summer | |
| Stanislav Ježek | Czech Republic | Canoe slalom | 2008 Summer, 2012 Summer | |
| Andrej Jezeršek | Slovenia | Nordic combined | 2002 Winter | |
| Barbara Jezeršek | Slovenia, Australia | Cross country skiing | 2010 Winter, 2014 Winter, 2018 Winter | |
| Alfons Jeżewski | Poland | Canoe sprint | 1948 Summer | |
| Zdravko Ježić | Yugoslavia | Water polo | 1952 Summer, 1956 Summer, 1960 Summer | |
| Andrzej Jezierski | Ireland | Canoe sprint | 2012 Summer | |
| Stanislav Ježík | Slovakia | Cross country skiing | 1998 Winter | |
| Yvonna Ježová | Czechoslovakia | Shooting | 1988 Summer | |
| Henriette Jæger | Norway | Athletics | 2024 Summer | |
| Kanak Jha | United States | Table tennis | 2016 Summer, 2020 Summer, 2024 Summer | |
| Jheniffer | Brazil | Football | 2024 Summer | |
| Mohamed Amin Jhinaoui | Tunisia | Athletics | 2024 Summer | |
| Eduardo Jhons | Cuba | Fencing | 1968 Summer, 1972 Summer, 1976 Summer | |