| Name | Nation | Sport | Games | Notes |
|---|
| Gilbert U | Hong Kong | Shooting | 1984 Summer, 1988 Summer, 1992 Summer | |
| U Jeong-hwan | South Korea | Football | 1948 Summer | |
| U Jung-ho | Equestrian jumping | 2004 Summer | |
| U Yang-ja | Athletics | 1988 Summer | |
| Jorge Uauy | Chile | Shooting | 1972 Summer | |
| Ovwigbo Uba | Nigeria | Boxing | 1988 Summer | |
| Reginald Uba | Estonia | Athletics | 1936 Summer | |
| Calister Ubah | Nigeria | 1996 Summer | |
| Rufina Ubah | 1980 Summer | |
| Juan Ubaldo | Dominican Republic | Boxing | 2000 Summer, 2004 Summer | |
| Marco Ubani [ Wikidata ] | Italy | Baseball | 1992 Summer, 1996 Summer | |
| Romas Ubartas | Soviet Union, Lithuania | Athletics | 1988 Summer, 1992 Summer, 2000 Summer | |
| Kerstin Ubben | Germany | Badminton | 1992 Summer, 1996 Summer | |
| Xavier Ubeira | Spain | Alpine skiing | 1992 Winter, 1994 Winter | |
| Ruggero Ubertalli | Italy | Equestrian jumping | 1920 Summer | |
| Francesco Uberti | Canoe sprint | 1984 Summer | |
| Miguel Ubeto | Venezuela | Road cycling | 2012 Summer, 2016 Summer | |
| Laszlo Ubori | Yugoslavia | Athletics | 1972 Summer | |
| Nemanja Ubović | Serbia | Water polo | 2024 Summer | |
| Alper Uçar | Turkey | Figure skating | 2014 Winter, 2018 Winter | |
| Jaime Ucar | Uruguay | Fencing | 1948 Summer | |
| Davide Uccellari | Italy | Triathlon | 2012 Summer, 2016 Summer | |
| Valentina Uccheddu | Athletics | 1992 Summer | |
| Jessenia Uceda [ Wikidata ] | Peru | Volleyball | 2000 Summer | |
| Scarleth Ucelo | Guatemala | Weightlifting | 2020 Summer | |
| Morgan Uceny | United States | Athletics | 2012 Summer | |
| Nino Uchadze | Georgia | Shooting | 1996 Summer, 2000 Summer | |
| Christy Ucheibe | Nigeria | Football | 2024 Summer | |
| Atsuto Uchida | Japan | 2008 Summer | |
| Masayoshi Uchida | Diving, Swimming | 1920 Summer | |
| Miki Uchida | Swimming | 2012 Summer, 2016 Summer | |
| Misaki Uchida [ Wikidata ] | Modern pentathlon | 2024 Summer | |
| Sho Uchida | Swimming | 2008 Summer | |
| Shoji Uchida | Modern pentathlon | 1976 Summer, 1984 Summer | |
| Yoshikazu Uchida | Art competitions | 1936 Summer | |
| Hiroko Uchida-Yokoyama | Athletics | 1960 Summer, 1964 Summer | |
| Moyuka Uchijima | Tennis | 2024 Summer | |
| Yoshitaka Uchikawa | Athletics | 1952 Summer | |
| Kohei Uchima | Road cycling | 2016 Summer | |
| Kōhei Uchimura | Artistic gymnastics | 2008 Summer, 2012 Summer, 2016 Summer, 2020 Summer | |
| Masao Uchino | Football | 1956 Summer | |
| Shigeaki Uchino | Modern pentathlon | 1960 Summer, 1964 Summer | |
| Takashi Uchino | Football | 2024 Summer | |
| Tsunehisa Uchino | Canoe sprint | 1988 Summer, 1992 Summer | |
| Tsuyaka Uchino | Track cycling | 2024 Summer | |
| Masato Uchishiba | Judo | 2004 Summer, 2008 Summer | |
| Kahori Uchiyama | Rowing | 2004 Summer | |
| Kyoko Uchiyama | Table tennis | 1988 Summer | |
| Noboru Uchiyama | Boxing | 1976 Summer | |
| Takashi Uchiyama | Artistic gymnastics | 1996 Summer | |
| Tamaki Uchiyama | Football | 1996 Summer | |
| Yuki Uchiyama | Artistic gymnastics | 2016 Summer | |
| Regina Uchoa | Brazil | Volleyball | 1984 Summer | |
| Felix Ucko | United States | Field hockey | 1948 Summer, 1956 Summer | |
| Kurt Ucko | 1956 Summer | |
| Göksu Üçtaş Şanlı | Turkey | Artistic gymnastics | 2012 Summer | |
| Magdalena Łuczak [ Wikidata ] | Poland | Alpine skiing | 2022 Winter | |
| Albert Udachin | Soviet Union | Shooting | 1964 Summer | |
| Artem Udachyn | Ukraine | Weightlifting | 2000 Summer, 2008 Summer | |
| Gennady Udalov | Soviet Union | Diving | 1952 Summer, 1956 Summer | |
| Jüri-Mikk Udam | Estonia | Rowing | 2012 Summer, 2020 Summer | |
| Erik Uddebom | Sweden | Athletics | 1956 Summer, 1960 Summer | |
| Shuja ud-Din | Afghanistan | Field hockey | 1936 Summer | |
| Filip Ude | Croatia | Artistic gymnastics | 2008 Summer, 2012 Summer, 2016 Summer | |
| Emeka Udechuku | Great Britain | Athletics | 2004 Summer | |
| Franco Udella | Italy | Boxing | 1968 Summer, 1972 Summer | |
| Erica Udén Johansson | Sweden | Ice hockey | 2010 Winter, 2014 Winter, 2018 Winter | |
| Juan Uder | Argentina | Basketball | 1948 Summer, 1952 Summer | |
| Ernst Udet | Germany | Art competitions | 1936 Summer | |
| Gabriel Udişteanu | Romania | Volleyball | 1972 Summer | |
| Oksana Udmurtova | Russia | Athletics | 2008 Summer | |
| Dele Udo | Nigeria | 1980 Summer | |
| Ndifreke Udo | Football | 2016 Summer | |
| Liudmila Udobkina | Russia | Bobsleigh | 2014 Winter | |
| Ivan Udodov | Soviet Union | Weightlifting | 1952 Summer | |
| Larisa Udodova | Unified Team, Uzbekistan | Freestyle skiing | 1992 Winter, 1994 Winter | |
| Blessed Udoh | Nigeria | Weightlifting | 2004 Summer | |
| Christy Udoh | Athletics | 2012 Summer | |
| Ekpe Udoh | Basketball | 2020 Summer | |
| Mfon Udoka | 2004 Summer | |
| Cherdchai Udompaichitkul | Thailand | Boxing | 1964 Summer, 1968 Summer | |
| Enefiok Udo-Obong | Nigeria | Athletics | 2000 Summer, 2004 Summer | |
| Bojan Udovič | Yugoslavia | Road cycling | 1980 Summer | |
| Vanja Udovičić | Serbia and Montenegro, Serbia | Water polo | 2004 Summer, 2008 Summer, 2012 Summer | |
| Raimundas Udrakis | Soviet Union | Equestrian jumping | 1988 Summer | |
| Aivo Udras | Estonia | Biathlon | 1992 Winter, 1994 Winter | |
| Juozas Ūdras | Soviet Union | Fencing | 1952 Summer, 1956 Summer | |
| Arnolds Ūdris | Latvia | Road cycling, Track cycling | 1992 Summer | |
| Raluca Udroiu | Romania | Swimming | 2000 Summer | |
| Reshika Udugampola | Sri Lanka | 2012 Summer | |
| Felix Uduokhai | Germany | Football | 2020 Summer | |
| István Udvardi | Hungary | Water polo | 1980 Summer | |
| Attapon Uea-aree | Thailand | Shooting | 2016 Summer | |
| Gary Uebergang | Australia | Rowing | 1976 Summer | |
| Wilhelm Uebler | Germany | Athletics | 1928 Summer | |
| Ai Ueda | Japan | Triathlon | 2008 Summer, 2012 Summer, 2016 Summer | |
| Ayase Ueda | Football | 2020 Summer | |
| Gen Ueda | Equestrian eventing | 1976 Summer | |
| Haruka Ueda | Swimming | 2008 Summer, 2012 Summer | |
| Kazuma Ueda | Rugby sevens | 2024 Summer | |
| Momone Ueda | Athletics | 2024 Summer | |
| Naomichi Ueda | Football | 2016 Summer | |
| Seiichi Ueda | Athletics | 1924 Summer | |
| Yoshihide Ueda | Shooting | 1956 Summer | |
| Kiyoshi Uehara | Fencing | 1972 Summer | |
| Koji Uehara | Baseball | 2004 Summer, 2008 Summer | |
| Mie Uehara | Speed skating | 1992 Winter, 1998 Winter | |
| Miyuki Uehara | Athletics | 2016 Summer | |
| Riko Ueki | Football | 2024 Summer | |
| Ayumi Uekusa | Karate | 2020 Summer | |
| Paul Uellendahl | Germany | Water polo | 1952 Summer | |
| Hitoshi Uematsu | Japan | Short track speed skating | 1998 Winter | |
| Jun Uematsu | 1994 Winter | |
| Kenji Uematsu | Spain | Judo | 2004 Summer | |
| Kiyoshi Uematsu | 2000 Summer, 2004 Summer, 2012 Summer | |
| Vicente Uematsu | Philippines | 1964 Summer | |
| Aiko Uemura | Japan | Freestyle skiing | 1998 Winter, 2002 Winter, 2006 Winter, 2010 Winter, 2014 Winter | |
| Haruki Uemura | Judo | 1976 Summer | |
| Kenichi Uemura | Football | 1996 Summer | |
| Miki Uemura | Artistic gymnastics | 2008 Summer | |
| Yukihiko Uemura | Handball | 1984 Summer | |
| Asahi Uenaka | Football | 2024 Summer | |
| Ueng Ming-yih | Chinese Taipei | Biathlon, Cross country skiing | 1976 Winter, 1984 Winter | |
| Masae Ueno | Japan | Judo | 2000 Summer, 2004 Summer, 2008 Summer | |
| Noboru Ueno | Athletics | 1936 Summer | |
| Osamu Ueno | Freestyle skiing | 2006 Winter | |
| Taro Ueno | Sailing | 2008 Summer | |
| Yoshie Ueno | Judo | 2012 Summer | |
| Yuka Ueno | Fencing | 2020 Summer, 2024 Summer | |
| Yukiko Ueno | Softball | 2004 Summer, 2008 Summer, 2020 Summer | |
| Ovini Uera | Nauru | Judo | 2016 Summer | |
| Tadao Uesako | Japan | Artistic gymnastics | 1952 Summer | |
| Shinobu Ueshima | Snowboarding | 1998 Winter | |
| Tatsuya Ueta | Volleyball | 1992 Summer | |
| Yasushi Ueta | Athletics | 1984 Summer | |
| Yojiro Uetake | Wrestling | 1964 Summer, 1968 Summer | |
| Ludwig Uettwiller | Germany | Athletics | 1908 Summer | |
| Koki Ueyama | Japan | 2024 Summer | |
| Yasuhiro Ueyama [ Wikidata ] | Trampolining | 2008 Summer, 2012 Summer | |
| Irina Ufimtseva | Russia | Swimming | 2000 Summer | |
| Elisa Uga | Italy | Fencing | 1996 Summer | |
| Antonio Ugalde | Spain | Handball | 2000 Summer | |
| Cristian Ugalde | 2012 Summer | |
| Alexei Ugarov | Belarus | Ice hockey | 2010 Winter | |
| Amaia Ugartamendía | Spain | Handball | 1992 Summer | |
| Alfredo Ugarte | Chile | Athletics | 1924 Summer, 1928 Summer | |
| Cecilio Ugarte | Spain | Artistic gymnastics | 1972 Summer | |
| Yordenis Ugás | Cuba | Boxing | 2008 Summer | |
| Ejike Ugboaja | Nigeria | Basketball | 2012 Summer | |
| Moses Ugbisien | Athletics | 1984 Summer, 1988 Summer | |
| Lorraine Ugen | Great Britain | 2016 Summer, 2020 Summer | |
| Bengt Uggla | Sweden | Modern pentathlon | 1920 Summer | |
| Bertil Uggla | Athletics, Fencing, Modern pentathlon | 1912 Summer, 1920 Summer, 1924 Summer, 1928 Summer | |
| Alberto Ughi | Italy | Canoe sprint | 1972 Summer | |
| Camillo Ugi | Germany | Football | 1912 Summer | |
| Gérard Ugolini | France | Athletics | 1968 Summer | |
| Maria Ugolkova | Switzerland | Swimming | 2016 Summer, 2020 Summer | |
| Giovanni Ugolotti | Italy | Equestrian eventing | 2024 Summer | |
| Panna Ugrai | Hungary | Swimming | 2024 Summer | |
| Vladimer Ugrekhelidze | Soviet Union | Basketball | 1960 Summer | |
| Ana Ugrinovska | North Macedonia | Canoe slalom | 1996 Summer | |
| Piotr Ugrumov | Russia | Road cycling | 1996 Summer | |
| Viktor Ugryumov | Soviet Union | Equestrian dressage | 1976 Summer, 1980 Summer | |
| Zaur Uguev | Russian Olympic Committee | Wrestling | 2020 Summer | |
| Chima Ugwu | Nigeria | Athletics | 1996 Summer, 2000 Summer | |
| Ugyen Ugyen | Bhutan | Archery | 1996 Summer | |
| Ferenc Uhereczky | Hungary | Track cycling | 1924 Summer | |
| Alan Uhi [ Wikidata ] | Tonga | Swimming | 2024 Summer | |
| Eleanor Uhl | United States | 1920 Summer | |
| Friedrich Uhl [ Wikidata ] | Germany | Field hockey | 1908 Summer | |
| Lisa Uhl | United States | Athletics | 2012 Summer | |
| Raul Uhl | Hungary | Sailing | 1928 Summer | |
| Katie Uhlaender | United States | Skeleton | 2006 Winter, 2010 Winter, 2014 Winter, 2018 Winter, 2022 Winter | |
| Karl Uhle | Germany | Football | 1912 Summer | |
| Detlef Uhlemann | West Germany | Athletics | 1976 Summer | |
| Gerda Uhlemann | East Germany | 1968 Summer | |
| Gabriele Uhlenbruck | West Germany | Field hockey | 1988 Summer | |
| Bernd Uhlig | East Germany | Fencing | 1968 Summer, 1972 Summer | |
| Frank Uhlig | Football | 1980 Summer | |
| Helmut Uhlig | West Germany | Basketball | 1972 Summer | |
| Petra Uhlig | East Germany | Handball | 1976 Summer, 1980 Summer | |
| Sepp Uhlmann | Germany | Fencing | 1936 Summer | |
| Jenő Uhlyárik | Hungary | 1924 Summer | |
| Łukasz Uhma | Poland | Artistic gymnastics | 1976 Summer | |
| Astrid Uhrenholdt Jacobsen | Norway | Cross country skiing | 2010 Winter, 2014 Winter, 2018 Winter | |
| Michelle Uhrig | Germany | Speed skating | 2018 Winter, 2022 Winter | |
| Peter Uhrig | Rowing | 1992 Summer, 1996 Summer | |
| Arnold Uhrlass | United States | Speed skating, Track cycling | 1960 Winter, 1964 Summer | |
| Michael Uhrmann | Germany | Ski jumping | 2002 Winter, 2006 Winter, 2010 Winter | |
| Michaela Uhrová | Czech Republic | Basketball | 2004 Summer, 2008 Summer | |
| Ui Yah-tor | Chinese Taipei | Artistic gymnastics | 1964 Summer | |
| Maicel Uibo | Estonia | Athletics | 2016 Summer, 2020 Summer | |
| Kuldip Singh Uijeer | Malaysia | Field hockey | 1968 Summer | |
| Carola Uilenhoed | Netherlands | Judo | 2008 Summer | |
| Yrjö Uimonen | Finland | Speed skating | 1956 Winter | |
| Dirk Uittenbogaard | Netherlands | Rowing | 2016 Summer, 2020 Summer | |
| Orgodolyn Üitümen | Mongolia | Wrestling | 2012 Summer, 2016 Summer | |
| Tümentsetsegiin Üitümen | Boxing | 1996 Summer, 2000 Summer | |
| CJ Ujah | Great Britain | Athletics | 2016 Summer, 2020 Summer | |
| Gabrijela Ujčić | Croatia | Swimming | 1996 Summer | |
| Tomáš Ujfaluši | Czech Republic | Football | 2000 Summer | |
| Beáta Újhelyi | Hungary | Swimming | 1996 Summer | |
| Rezső Újlaki [ Wikidata ] | Athletics | 1912 Summer | |
| Virginie Ujlaky | Fencing | 2008 Summer | |
| Antal Újváry | Handball | 1936 Summer | |
| Andrzej Ujwary | Poland | Ice hockey | 1980 Winter, 1984 Winter | |
| Miles Ukaoma | Nigeria | Athletics | 2016 Summer | |
| Krzysztof Łukasik | Poland | Cycling mountain bike | 2024 Summer | |
| Robert Łukaszewicz [ Wikidata ] | Diving | 2024 Summer | |
| Ivan Ukhov | Russia | Athletics | 2012 Summer | |
| Vladimir Ukhov | Soviet Union | 1952 Summer | |
| Roko Ukić | Croatia | Basketball | 2008 Summer, 2016 Summer | |
| Rui Ukita | Japan | Ice hockey | 2014 Winter, 2018 Winter, 2022 Winter | |
| Pertti Ukkola | Finland | Wrestling | 1972 Summer, 1976 Summer, 1980 Summer | |
| Riikka Ukkola | Swimming | 1992 Summer | |
| Imaobong Nse Uko | Nigeria | Athletics | 2020 Summer | |
| Chierika Ukogu | Rowing | 2016 Summer | |
| Dmitry Ukolov | Soviet Union | Ice hockey | 1956 Winter | |
| Elizaveta Ukolova | Czech Republic | Figure skating | 2014 Winter | |
| Evgenia Ukolova | Russia | Beach volleyball | 2012 Summer, 2016 Summer | |
| Tokutaro Ukon | Japan | Football | 1936 Summer | |
| Ese Ukpeseraye | Nigeria | Road cycling, Track cycling | 2024 Summer | |
| Vladislava Ukraintseva | Russia | Sailing | 2000 Summer | |
| Aleksa Ukropina | Montenegro | Water polo | 2020 Summer | |
| Fridrihs Ukstiņš | Latvia | Track cycling | 1924 Summer, 1928 Summer | |
| Nigina Uktamova [ Wikidata ] | Uzbekistan | Boxing | 2024 Summer | |
| Rustam Ukumanov | Kazakhstan | Water polo | 2012 Summer, 2020 Summer | |
| Luis Ulacia | Cuba | Baseball | 1992 Summer, 1996 Summer, 2000 Summer | |
| Abdi Hakin Ulad | Denmark | Athletics | 2016 Summer, 2020 Summer | |
| Primož Ulaga | Yugoslavia | Ski jumping | 1984 Winter, 1988 Winter | |
| Alexei Ulanov | Soviet Union | Figure skating | 1972 Winter | |
| Denis Ulanov | Kazakhstan | Weightlifting | 2016 Summer | |
| Vladimir Ulanov | Soviet Union | Volleyball | 1976 Summer | |
| Ekaterina Ulanova | Russia | 2008 Summer, 2012 Summer | |
| Dirk Ulaszewski | West Germany | Canoe sprint | 1988 Summer | |
| Pua Ulberg | Samoa | Boxing | 1988 Summer | |
| Daniela Ulbing | Austria | Snowboarding | 2018 Winter, 2022 Winter | |
| Maximilian Ulbrich | Germany | Shooting | 2024 Summer | |
| Peter Ulbrich | East Germany | Fencing | 1980 Summer | |
| Lutz Ulbricht | West Germany | Rowing | 1968 Summer, 1972 Summer | |
| Manfred Ulbricht | East Germany | Track cycling | 1968 Summer | |
| Sigrid Ulbricht | Athletics | 1980 Summer | |
| Al Ulbrickson | United States | Rowing | 1952 Summer | |
| Jerzy Ulczyński | Poland | 1972 Summer, 1976 Summer | |
| Hans Olav Uldal | Norway | Athletics | 2004 Summer | |
| Sergey Ulegin | Russia | Canoe sprint | 2008 Summer | |
| Ivar Michal Ulekleiv | Norway | Biathlon | 1994 Winter | |
| Kristian Ulekleiv [ Wikidata ] | Speed skating | 2022 Winter | |
| Marius Ulfrstad | Art competitions | 1924 Summer, 1928 Summer | |
| Yury Uliachenko | Kyrgyzstan | Canoe sprint | 1996 Summer | |
| Jorge Luis Ulibarri | Spain | Swimming | 2000 Summer | |
| Steffen Uliczka | Germany | Athletics | 2012 Summer | |
| John Ulinder | Canada | Rowing | 1968 Summer | |
| Santiago Ulio | Spain | Diving | 1924 Summer | |
| Gretchen Ulion | United States | Ice hockey | 1998 Winter | |
| Marija Ulitina | Ukraine | Badminton | 2016 Summer, 2020 Summer | |
| Luigi Ulivelli | Italy | Athletics | 1960 Summer | |
| Egle Uljas | Estonia | 2004 Summer | |
| Gagan Ullalmath | India | Swimming | 2012 Summer | |
| Frithjof Ulleberg | Norway | Football | 1936 Summer | |
| Günther Ullerich | Germany | Field hockey | 1952 Summer, 1956 Summer, 1960 Summer | |
| Torsten Ullman | Sweden | Shooting | 1936 Summer, 1948 Summer, 1952 Summer, 1956 Summer, 1960 Summer | |
| Antonio Ullo | Italy | Athletics | 1984 Summer | |
| Carlota Ulloa | Chile | 1968 Summer | |
| Emilio Ulloa | 1984 Summer, 1988 Summer | |
| Gerardo Ulloa | Mexico | Cycling mountain bike | 2020 Summer | |
| Artur Ullrich | East Germany | Football | 1980 Summer | |
| Frank Ullrich | Biathlon | 1976 Winter, 1980 Winter, 1984 Winter | |
| Jan Ullrich | Germany | Road cycling | 2000 Summer, 2004 Summer | |
| Logan Ullrich | New Zealand | Rowing | 2024 Summer | |
| Walter Ullrich | Czechoslovakia | Ice hockey | 1936 Winter | |
| Lars Magne Ullvang | Norway | Canoe sprint | 2020 Summer | |
| Kevin Ullyett | Zimbabwe | Tennis | 2000 Summer, 2004 Summer | |
| Robert Ullyett | Field hockey | 1964 Summer | |
| Stefan Ulm | Germany | Canoe sprint | 2000 Summer, 2004 Summer | |
| Risto Ulmala | Finland | Athletics | 1992 Summer, 1996 Summer | |
| Harun Ülman | Turkey | Sailing | 1936 Summer | |
| Sarah Ulmer | New Zealand | Track cycling | 1996 Summer, 2000 Summer, 2004 Summer | |
| Stefan Ulmer | Austria | Ice hockey | 2014 Winter | |
| Benedict Uloko | Nigeria | Weightlifting | 2008 Summer | |
| Christin Ulrich | Germany | 2012 Summer | |
| Einer Ulrich | Denmark | Tennis | 1924 Summer | |
| Erika Ulrich | Switzerland | Archery | 1980 Summer | |
| Friedrich-Wilhelm Ulrich | East Germany | Rowing | 1976 Summer, 1980 Summer | |
| Günther Ulrich | Austria | Fencing | 1960 Summer, 1972 Summer | |
| Herbert Ulrich | Ice hockey | 1948 Winter | |
| Jayden Ulrich | United States | Athletics | 2024 Summer | |
| Marek Ulrich | Germany | Swimming | 2020 Summer, 2024 Summer | |
| Martin Ulrich | Austria | Ice hockey | 1994 Winter, 1998 Winter, 2002 Winter | |
| Renato Ulrich | Switzerland | Freestyle skiing | 2006 Winter, 2010 Winter, 2014 Winter | |
| Thomas Ulrich | Germany | Boxing | 1996 Summer | |
| Werner Ulrich | Canoe sprint | 1960 Summer | |
| Klára Ulrichová [ Wikidata ] | Czech Republic | Ski jumping | 2022 Winter | |
| Emil André Ulsletten | Norway | Snowboarding | 2014 Winter | |
| Thomas Ulsrud | Curling | 2010 Winter, 2014 Winter, 2018 Winter | |
| Detlef Ultsch | East Germany | Judo | 1976 Summer, 1980 Summer | |
| İsmet Uluğ | Turkey | Football | 1924 Summer, 1928 Summer | |
| Teresa Ulundo | Angola | Handball | 2000 Summer | |
| Reapi Ulunisau | Fiji | Rugby sevens | 2020 Summer, 2024 Summer | |
| Bülent Ulusoy | Turkey | Boxing | 2000 Summer, 2004 Summer | |
| Duygu Ulusoy | Alpine skiing | 2006 Winter | |
| Jade Ulutule | France | Rugby sevens | 2016 Summer, 2020 Summer | |
| Vegard Ulvang | Norway | Cross country skiing | 1988 Winter, 1992 Winter, 1994 Winter | |
| Vera Ulyakina | Russia | Volleyball | 2016 Summer | |
| Nikolay Ulyanin | Kazakhstan | Speed skating | 2002 Winter | |
| Dmitry Ulyanov | Russia | Alpine skiing | 2006 Winter | |
| Dina Ulyanova | Azerbaijan | 3x3 basketball | 2024 Summer | |
| Iolanta Ulyeva | Kazakhstan | Athletics | 2000 Summer, 2004 Summer, 2008 Summer | |
| Heinz Ulzheimer | Germany | 1952 Summer | |
| Um Ji-eun | South Korea | Wrestling | 2012 Summer | |
| Um Min-ji | Curling | 2014 Winter | |
| Um Won-sang | Football | 2020 Summer | |
| Um Young-sup | Track cycling | 1988 Summer | |
| Bagavdin Umakhanov | Russia | Wrestling | 1996 Summer | |
| Murad Umakhanov | 2000 Summer, 2004 Summer | |
| José Umaña | Venezuela | Swimming | 1984 Summer | |
| Michael Umaña | Costa Rica | Football | 2004 Summer | |
| Nina Umanets | Soviet Union | Rowing | 1980 Summer | |
| Aminu Umar | Nigeria | Football | 2016 Summer | |
| Olga Umaralieva | Uzbekistan | Canoe sprint | 2016 Summer | |
| Gintautas Umaras | Soviet Union | Track cycling | 1988 Summer | |
| Mindaugas Umaras | Soviet Union, Lithuania | 1988 Summer, 1996 Summer | |
| Gadzhi Umarov | Russia | Taekwondo | 2012 Summer | |
| Makhmud Umarov | Soviet Union | Shooting | 1956 Summer, 1960 Summer | |
| Charles Umbs | United States | Artistic gymnastics | 1904 Summer | |
| John Ume | Papua New Guinea | Boxing | 2020 Summer, 2024 Summer | |
| Akihiko Umeda | Japan | Wrestling | 1972 Summer | |
| Michael Umeh | Nigeria | Basketball | 2016 Summer | |
| Stella Umeh | Canada | Artistic gymnastics | 1992 Summer | |
| Reina Umehara | Japan | Freestyle skiing | 2018 Winter | |
| Karlo Umek | Yugoslavia | Shooting | 1960 Summer | |
| Mami Umeki | Japan | Judo | 2016 Summer | |
| Aya Umemura | Table tennis | 2004 Summer | |
| Ryutaro Umeno | Baseball | 2020 Summer | |
| Siddique Umer [ Wikidata ] | Pakistan | Shooting | 2008 Summer | |
| Kenichi Umezawa | Japan | Fencing | 1984 Summer, 1988 Summer | |
| Yuji Umezawa | Canoe sprint | 1964 Summer | |
| Alfred Umgeher | Austria | 1948 Summer | |
| Jadwiga Umińska | Poland | Art competitions | 1932 Summer | |
| Pongummart Ummarttayakul | Thailand | Athletics | 1952 Summer | |
| Itoro Coleman | Nigeria | Basketball | 2004 Summer | |
| Chainey Umphrey | United States | Artistic gymnastics | 1996 Summer | |
| Hernan Umpierre [ Wikidata ] | Uruguay | Sailing | 2024 Summer | |
| Dhawee Umponmaha | Thailand | Boxing | 1984 Summer | |
| Victoria Umunna | Nigeria | Handball | 1992 Summer | |
| Johanna Umurungi | Rwanda | Swimming | 2016 Summer | |
| Djazilla Umwamikazi [ Wikidata ] | Cycling mountain bike | 2024 Summer | |
| Unai Vergara | Spain | Football | 2000 Summer | |
| Ahmet Ünal | Turkey | Cross country skiing | 1976 Winter | |
| Buğra Ünal | Modern pentathlon | 2024 Summer | |
| Engin Ünal | Swimming | 1960 Summer | |
| Mehmet Nadir Ünal | Boxing | 2016 Summer | |
| Heshan Unamboowe | Sri Lanka | Swimming | 2012 Summer | |
| Yunus Nüzhet Unat | Turkey | Track cycling | 1928 Summer | |
| Maider Unda | Spain | Wrestling | 2008 Summer, 2012 Summer | |
| Zuus Undapp | Indonesia | Fencing | 1960 Summer | |
| Félix Unden | Luxembourg | Water polo | 1928 Summer | |
| Barbara Underhill | Canada | Figure skating | 1980 Winter, 1984 Winter | |
| Beth Underhill | Equestrian jumping | 1992 Summer | |
| George Underwood | United States | Athletics | 1904 Summer | |
| Quanitta Underwood | Boxing | 2012 Summer | |
| Lkhagvaagiin Undralbat | Mongolia | Shooting | 1988 Summer | |
| Kjetil Undset | Norway | Rowing | 1992 Summer, 1996 Summer, 2000 Summer | |
| Jacob Une | Sweden | Football | 2016 Summer | |
| Yoshiaki Unetani | Japan | Athletics | 1972 Summer | |
| Michel Ungeheuer | Luxembourg | Football | 1920 Summer | |
| Matthias Ungemach | Germany | Rowing | 1992 Summer, 1996 Summer | |
| Anna Unger | East Germany | Cross country skiing | 1968 Winter, 1972 Winter | |
| Astrid Unger | Austria | Rowing | 1984 Summer | |
| Daniel Unger | Germany | Triathlon | 2008 Summer | |
| Donald Unger | Switzerland | Ice hockey | 1924 Winter | |
| Göran Unger | Sweden | Athletics | 1924 Summer | |
| Göran Unger | Basketball | 1980 Summer | |
| Helmut Unger | East Germany | Cross country skiing | 1968 Winter | |
| Lutz Unger | Swimming | 1972 Summer | |
| Monika Unger | Austria | Handball | 1984 Summer | |
| Susanne Unger | 1984 Summer | |
| Tobias Unger | Germany | Athletics | 2004 Summer, 2008 Summer, 2012 Summer | |
| Tony Unger | Zimbabwe | Field hockey | 1964 Summer | |
| Werner Unger | Germany | Football | 1964 Summer | |
| Nadine Ungerank | Austria | Shooting | 2024 Summer | |
| Adrian Ungur | Romania | Tennis | 2012 Summer | |
| Alexandra Ungureanu [ Wikidata ] | Rowing | 2024 Summer | |
| Marius Ungureanu | Biathlon | 2018 Winter | |
| Monica Ungureanu | Judo | 2016 Summer | |
| Paula Ungureanu | Handball | 2016 Summer | |
| Teodora Ungureanu | Artistic gymnastics | 1976 Summer | |
| Vasile Ungureanu | Water polo | 1980 Summer | |
| Attila Ungvári | Hungary | Judo | 2020 Summer, 2024 Summer | |
| Miklós Ungvári | 2004 Summer, 2008 Summer, 2012 Summer, 2016 Summer | |
| Won Un-gyong [ Wikidata ] | North Korea | Boxing | 2024 Summer | |
| Kim Un-hyang [ Wikidata ] | Football | 2012 Summer | |
| Baturalp Ünlü | Turkey | Swimming | 2020 Summer | |
| Shoma Uno | Japan | Figure skating | 2018 Winter, 2022 Winter | |
| Luny Unold | Switzerland | 1948 Winter | |
| Florian Unruh | Germany | Archery | 2020 Summer, 2024 Summer | |
| Lisa Unruh | 2016 Summer, 2020 Summer | |
| Selda Ünsal | Turkey | 1988 Summer | |
| Yalçın Ünsal | Athletics | 1960 Summer | |
| Xaver Unsinn | Germany | Ice hockey | 1952 Winter, 1960 Winter | |
| Laura Unsworth | Great Britain | Field hockey | 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| Ron Unsworth | Athletics | 1948 Summer | |
| Anton Unterkofler | Austria | Snowboarding | 2014 Winter | |
| Franz Unterlechner | Skeleton | 1928 Winter | |
| Gerhard Unterluggauer | Ice hockey | 1998 Winter, 2002 Winter, 2014 Winter | |
| Hans-Jörg Unterrainer | Snowboarding | 2006 Winter | |
| Ramon Untersander | Switzerland | Ice hockey | 2018 Winter, 2022 Winter | |
| Uwe Unterwalder | East Germany | Track cycling | 1972 Summer, 1976 Summer, 1980 Summer | |
| Lisa Unterweger | Austria | Cross country skiing | 2018 Winter, 2022 Winter | |
| Kathrin Unterwurzacher | Judo | 2016 Summer | |
| Chris Unthank | Australia | Athletics | 1996 Summer, 2000 Summer | |
| Maka Unufe | United States | Rugby sevens | 2016 Summer, 2024 Summer | |
| Frederick Unwin | Great Britain | Swimming | 1908 Summer | |
| Paiboon Unyapo | Thailand | Football | 1968 Summer | |
| Martti Uosikkinen | Finland | Artistic gymnastics | 1928 Summer, 1932 Summer, 1936 Summer | |
| Sami Uotila | Alpine skiing | 1998 Winter, 2002 Winter | |
| Pentti Uotinen | Ski jumping | 1952 Winter | |
| Lalit Upadhyay | India | Field hockey | 2020 Summer, 2024 Summer | |
| Rolands Upatnieks | Soviet Union | Luge | 1976 Winter | |
| Dainis Upelnieks | Latvia | Shooting | 2016 Summer | |
| Gundars Upenieks | Biathlon | 1992 Winter, 1994 Winter, 1998 Winter, 2002 Winter | |
| Tom Upham | United States | Nordic combined | 1968 Winter | |
| Zoe Uphill | Australia | Rowing | 2008 Summer | |
| Nicole Uphoff | West Germany, Germany | Equestrian dressage | 1988 Summer, 1992 Summer, 1996 Summer | |
| Aleksandrs Upmals | Russia | Athletics | 1912 Summer | |
| Veera Uppapong | Thailand | Shooting | 1976 Summer | |
| Dmitri Upper | Kazakhstan | Ice hockey | 2006 Winter | |
| Helen Upperton | Canada | Bobsleigh | 2006 Winter, 2010 Winter | |
| Oskar Üpraus | Estonia | Football | 1924 Summer | |
| Ken Uprichard | New Zealand | Archery | 2000 Summer, 2004 Summer | |
| Sebastián Uprimny | Colombia | Cross country skiing | 2018 Winter | |
| Grace Upshaw | United States | Athletics | 2004 Summer, 2008 Summer | |
| Orrin Upshaw | Tug of war | 1904 Summer | |
| David Upson | Great Britain | Canoe sprint | 1984 Summer | |
| Eric Uptagrafft | United States | Shooting | 1996 Summer, 2012 Summer | |
| Sandra Uptagrafft | 2012 Summer, 2020 Summer | |
| A. R. Upton | Belgium | Water polo | 1900 Summer | |
| Joan Upton | Great Britain | Athletics | 1948 Summer | |
| Róisín Upton | Ireland | Field hockey | 2020 Summer | |
| Simon Upton | Australia | Swimming | 1988 Summer | |
| Melisa Upu | New Zealand | Softball | 2000 Summer | |
| Eruna Ura | Japan | Water polo | 2020 Summer | |
| Kazushige Ura | Rowing | 2004 Summer, 2008 Summer, 2012 Summer | |
| Hideo Urabe | Ice hockey | 1976 Winter, 1980 Winter | |
| Ran Urabe | Athletics | 2020 Summer | |
| Miroslav Úradník | Slovakia | 2020 Summer | |
| Gerhard Urain | Austria | Cross country skiing | 1998 Winter, 2002 Winter | |
| Ryoko Urakami | Japan | Swimming | 1964 Summer | |
| Gulzat Uralbayeva | Kazakhstan | Judo | 2008 Summer | |
| Yulen Uralov | Soviet Union | Fencing | 1952 Summer | |
| Dilara Uralp | Turkey | Sailing | 2016 Summer, 2020 Summer | |
| Juan Urán | Colombia | Diving | 2000 Summer, 2004 Summer, 2008 Summer | |
| Rigoberto Urán | Road cycling | 2008 Summer, 2012 Summer, 2016 Summer, 2020 Summer | |
| Francisco Uranga | Argentina | Swimming, Water polo | 1928 Summer | |
| Nancy Uranga | Cuba | Fencing | 1976 Summer | |
| Jože Urankar | Yugoslavia | Weightlifting | 1972 Summer | |
| Mönkhbatyn Urantsetseg | Mongolia | Judo | 2012 Summer, 2016 Summer, 2020 Summer | |
| Bishindeegiin Urantungalag | Archery | 2012 Summer, 2020 Summer | |
| János Urányi | Hungary | Canoe sprint | 1948 Summer, 1952 Summer, 1956 Summer | |
| Ali Uras | Turkey | Basketball | 1952 Summer | |
| Onur Uras | Swimming | 2004 Summer, 2008 Summer | |
| Haruo Urata | Japan | Athletics | 1992 Summer | |
| Kana Urata | Field hockey | 2024 Summer | |
| Zoltan Uray | Romania | Fencing | 1952 Summer | |
| Vladislava Urazova | Russian Olympic Committee | Artistic gymnastics | 2020 Summer | |
| Dieter Urbach | Germany | Athletics | 1960 Summer | |
| Eithan Urbach | Israel | Swimming | 1996 Summer, 2000 Summer | |
| Josef Urbach | Germany | Art competitions | 1936 Summer | |
| Joao Urbáez | Dominican Republic | Football | 2024 Summer | |
| Paul Urbain | Belgium | Field hockey | 1976 Summer | |
| Adolf Urban | Germany | Football | 1936 Summer | |
| Anton Urban | Czechoslovakia | 1964 Summer | |
| Dirk Urban | Germany | Athletics | 1996 Summer | |
| Edit Urban | Hungary | Table tennis | 1988 Summer | |
| Horst Urban | Czechoslovakia | Luge | 1964 Winter, 1968 Winter | |
| Jochen Urban | Germany | Rowing | 2004 Summer, 2008 Summer | |
| Josef Urban | Czechoslovakia | Wrestling | 1928 Summer, 1932 Summer | |
| Maria Urban | West Germany | Archery | 1976 Summer | |
| Peter Urban | Canada | Fencing | 1976 Summer | |
| Petr Urban | Czechoslovakia | Luge | 1988 Winter, 1992 Winter | |
| Roland Urban | 1964 Winter, 1968 Winter | |
| Stanisław Urban | Poland | Rowing | 1928 Summer, 1932 Summer | |
| Nataša Urbančič | Yugoslavia | Athletics | 1968 Summer, 1972 Summer | |
| Aleksandra Urbańczyk | Poland | Swimming | 2016 Summer | |
| Elżbieta Urbańczyk | Canoe sprint | 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer | |
| Klaus Urbanczyk | Germany | Football | 1964 Summer | |
| Robert Urbanek | Poland | Athletics | 2012 Summer, 2016 Summer | |
| Dino Urbani | Italy | Fencing | 1920 Summer | |
| Mara Urbani | Short track speed skating | 1994 Winter, 1998 Winter | |
| Riccardo Urbani | Swimming | 1976 Summer | |
| Dorota Urbaniak | Canada | Rowing | 2000 Summer | |
| Lena Urbaniak | Germany | Athletics | 2016 Summer | |
| Danuta Urbanik | Poland | 2016 Summer | |
| Mária Urbanik | Hungary | 1992 Summer, 1996 Summer, 2000 Summer | |
| Sándor Urbanik | 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer | |
| Bianca Urbanke | Germany | Handball | 1992 Summer, 1996 Summer | |
| Urbano Ortega | Spain | Football | 1980 Summer | |
| Ana Urbano | Argentina | Rowing | 1996 Summer | |
| José Urbano | Portugal | Athletics | 1988 Summer, 1992 Summer, 1996 Summer | |
| Marta Urbanová | Czechoslovakia | Field hockey | 1980 Summer | |
| Galina Urbanovich | Soviet Union | Artistic gymnastics | 1952 Summer | |
| Miklós Urbanovics | Hungary | Wrestling | 1972 Summer | |
| Leszek Urbanowicz | Poland | Volleyball | 1996 Summer | |
| Calla Urbanski | United States | Figure skating | 1992 Winter | |
| Igor Urbanski | Ukraine | Luge | 1994 Winter, 1998 Winter | |
| Ulrike Urbansky | Germany | Athletics | 2000 Summer, 2004 Summer | |
| Gregor Urbas | Slovenia | Figure skating | 2006 Winter, 2010 Winter | |
| Jan Urbas | Ice hockey | 2014 Winter, 2018 Winter | |
| Marcin Urbaś | Poland | Athletics | 2000 Summer, 2004 Summer | |
| José Urbay | Cuba | Sailing | 2000 Summer | |
| Ibon Urbieta | Spain | Rowing | 1988 Summer, 1992 Summer | |
| María Urbina | Mexico | Swimming | 1984 Summer | |
| Jean-Pierre Urbing | Luxembourg | Artistic gymnastics | 1928 Summer | |
| Marian Urdabayeva | Kazakhstan | Judo | 2016 Summer | |
| Finn Urdal | Norway | Handball | 1972 Summer | |
| Iñaki Urdangarin | Spain | 1992 Summer, 1996 Summer, 2000 Summer | |
| Fernando Urdapilleta | Argentina | Equestrian eventing | 1960 Summer | |
| Alberto Urdiales | Spain | Handball | 1992 Summer, 1996 Summer, 2000 Summer | |
| Santos Urdinarán | Uruguay | Football | 1924 Summer, 1928 Summer | |
| Diana Ureche | Romania | Swimming | 1992 Summer | |
| Emma Uren | Great Britain | Rugby sevens | 2020 Summer, 2024 Summer | |
| Jorge Ureña | Spain | Athletics | 2020 Summer, 2024 Summer | |
| Óscar Ureña | Dominican Republic | Football | 2024 Summer | |
| Eva Urevc | Slovenia | Cross country skiing | 2022 Winter | |
| Muhammad Urfaq | Pakistan | Athletics | 1988 Summer | |
| Getenesh Urge | Ethiopia | 1992 Summer | |
| Alejandro Urgelles Guibot | Cuba | Basketball | 1972 Summer, 1976 Summer, 1980 Summer | |
| Lucila Urgelles | Volleyball | 1976 Summer, 1980 Summer | |
| Yoandry Urgellés | Baseball | 2004 Summer, 2008 Summer | |
| Valo Urho | Finland | Sailing | 1948 Summer | |
| Eelco Uri | Netherlands | Water polo | 1996 Summer, 2000 Summer | |
| Juan José Uría | Spain | Handball | 1980 Summer, 1984 Summer, 1988 Summer | |
| Julia Uria | Cuba | Artistic gymnastics | 1960 Summer | |
| Jon Uriarte | Argentina | Volleyball | 1984 Summer, 1988 Summer | |
| Nicolás Uriarte | 2012 Summer | |
| Sugoi Uriarte | Spain | Judo | 2012 Summer, 2016 Summer | |
| Julio César Urías | Guatemala | Athletics | 1996 Summer | |
| Ángel Uribe | Peru | Football | 1960 Summer | |
| Carlos Uribe | Colombia | 1992 Summer | |
| Cenaida Uribe | Peru | Volleyball | 1988 Summer | |
| Eduardo Uribe | Mexico | Road cycling | 1996 Summer | |
| Luis Uribe | Colombia | Diving | 2024 Summer | |
| María Uribe | Mexico | Athletics | 1932 Summer | |
| Mariajo Uribe | Colombia | Golf | 2016 Summer, 2020 Summer, 2024 Summer | |
| Pablo Uribe | Fencing | 1956 Summer | |
| Mario Uriburu | Argentina | Sailing | 1924 Summer | |
| Bogdan Đurđić [ Wikidata ] | Montenegro | Water polo | 2024 Summer | |
| Ronald Urick | United States | Canoe sprint | 1988 Summer | |
| Aleksandr Urinov | Uzbekistan | Weightlifting | 1996 Summer, 2004 Summer | |
| Rolando Uríos | Cuba, Spain | Handball | 2000 Summer, 2004 Summer | |
| Anzor Urishev | Russia | Wrestling | 2012 Summer | |
| Rubén Uriza | Mexico | Equestrian jumping | 1948 Summer | |
| Oktay Urkal | Germany | Boxing | 1996 Summer | |
| Santiago Urkiaga | Spain | Football | 1980 Summer | |
| Elena Urkizu | Field hockey | 1996 Summer, 2000 Summer | |
| Giampaolo Urlando | Italy | Athletics | 1976 Summer, 1980 Summer, 1984 Summer | |
| Luca Urlando | United States | Swimming | 2024 Summer | |
| Franz Urlesberger | Austria | Sailing | 1996 Summer | |
| Alexei Urmanov | Unified Team, Russia | Figure skating | 1992 Winter, 1994 Winter | |
| Tine Urnaut | Slovenia | Volleyball | 2024 Summer | |
| Veljko Urošević | Serbia and Montenegro | Rowing | 2004 Summer | |
| Diyorbek Urozboev | Uzbekistan | Judo | 2016 Summer | |
| José Antonio Urquijo | Chile | Track cycling | 1984 Summer | |
| Martin Urra | Philippines | Basketball | 1956 Summer | |
| Raúl Urra | Chile | 1956 Summer | |
| Héctor Urrego | Colombia | Track cycling | 1968 Summer | |
| Jorge Urreta | Mexico | Swimming | 1968 Summer, 1972 Summer | |
| Jonathan Urretaviscaya | Uruguay | Football | 2012 Summer | |
| Roberto Urretavizcaya | Argentina | Boxing | 1968 Summer | |
| Aliecer Urrutia | Cuba | Athletics | 1996 Summer | |
| Ángel Urrutia | Spain | Rowing | 1968 Summer | |
| Ermidelio Urrutia | Cuba | Baseball | 1992 Summer | |
| María Isabel Urrutia | Colombia | Athletics, Weightlifting | 1988 Summer, 2000 Summer | |
| María José Urrutia | Chile | Football | 2020 Summer | |
| Osmani Urrutia | Cuba | Baseball | 2004 Summer | |
| Roberto Urrutia | Cuba, United States | Weightlifting | 1976 Summer, 1988 Summer, 1992 Summer | |
| Yosiris Urrutia | Colombia | Athletics | 2016 Summer, 2020 Summer | |
| Chris Urry | New Zealand | Sailing | 1976 Summer | |
| Wiltrud Urselmann | Germany | Swimming | 1960 Summer, 1964 Summer | |
| Giorgio Ursi | Italy | Track cycling | 1964 Summer | |
| Vladislav Ursu [ Wikidata ] | Moldova | Table tennis | 2024 Summer | |
| Sonia Ursu-Kim | Romania | 3x3 basketball | 2020 Summer | |
| Māris Urtāns | Latvia | Athletics | 2008 Summer, 2012 Summer | |
| Luis Alberto Urteaga | Peru | Modern pentathlon | 1992 Summer | |
| Anissa Urtez | Mexico | Softball | 2020 Summer | |
| Jade Uru | New Zealand | Rowing | 2012 Summer, 2016 Summer | |
| Storm Uru | 2008 Summer, 2012 Summer | |
| José Urueta [ Wikidata ] | Mexico | Swimming | 1972 Summer, 1976 Summer | |
| Leonor Urueta | 1972 Summer | |
| Tomeju Uruma | Japan | Speed skating | 1932 Winter | |
| Kamil Urumbaev | Uzbekistan | Alpine skiing | 1998 Winter, 2002 Winter | |
| Elmira Urumbaeva | 2002 Winter | |
| Oston Urunov | Football | 2024 Summer | |
| Elvira Urusova | Georgia | Athletics | 1996 Summer | |
| Annika Urvikko | Finland | Artistic gymnastics | 2012 Summer | |
| Vihtori Urvikko | Wrestling | 1912 Summer | |
| Natalya Uryadova | Russia | Beach volleyball | 2008 Summer | |
| Anna Uryniuk | Poland | Swimming | 1992 Summer, 1996 Summer, 2000 Summer | |
| Agustín Urzi | Argentina | Football | 2020 Summer | |
| Marius Urzică | Romania | Artistic gymnastics | 1996 Summer, 2000 Summer, 2004 Summer | |
| Viktoriia Us | Ukraine | Canoe slalom | 2016 Summer, 2020 Summer, 2024 Summer | |
| Mykhailo Usach | Archery | 2024 Summer | |
| Dmitry Usagin | Bulgaria | Boxing | 2000 Summer | |
| Akio Usami | Japan | Athletics | 1968 Summer, 1972 Summer, 1976 Summer | |
| Daisuke Usami | Volleyball | 2008 Summer | |
| Takashi Usami | Football | 2012 Summer | |
| Toshio Usami | Field hockey | 1932 Summer | |
| Sofía Usandizaga | Argentina | Sailing | 1996 Summer | |
| Elena Usarova [ Wikidata ] | Uzbekistan | Rowing | 2004 Summer | |
| Ivan Usaty | Soviet Union | Handball | 1972 Summer | |
| André Usborne | Great Britain | Luge | 1984 Winter | |
| Renārs Uščins | Germany | Handball | 2024 Summer | |
| Aleksandra Uścińska | Poland | Taekwondo | 2004 Summer | |
| Milena Usenik | Yugoslavia | Athletics | 1956 Summer, 1960 Summer | |
| P. T. Usha | India | 1980 Summer, 1984 Summer, 1988 Summer | |
| Dmitry Ushakov | Russia, Russian Olympic Committee | Trampolining | 2008 Summer, 2012 Summer, 2016 Summer, 2020 Summer | |
| Konstantin Ushakov | Unified Team, Russia | Volleyball | 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer | |
| Vitaly Ushakov | Soviet Union | Water polo | 1952 Summer | |
| Vladimir Ushakov | Kazakhstan | 2012 Summer | |
| Irina Ushakova | Soviet Union | Fencing | 1980 Summer | |
| Carlton Usher | Belize | Athletics | 1988 Summer | |
| Scott Usher | United States | Swimming | 2004 Summer | |
| Shigeaki Ushijima | Japan | Luge | 1998 Winter, 2002 Winter, 2006 Winter | |
| Kyohei Ushio | Athletics | 1956 Summer | |
| Kohane Ushioku | Artistic gymnastics | 2024 Summer | |
| Keisuke Ushiro | Athletics | 2012 Summer, 2016 Summer | |
| Takahiro Ushiyama | Speed skating | 2006 Winter | |
| Oleksandr Ushkalenko | Ukraine | Cross country skiing | 1998 Winter | |
| Sergey Ushkalov | Kazakhstan | Swimming | 1996 Summer | |
| Zhaksylyk Ushkempirov | Soviet Union | Wrestling | 1980 Summer | |
| Natalia Ushkina [ Wikidata ] | Romania | Biathlon | 2022 Winter | |
| Konstantin Ushkov | Russia, Kyrgyzstan | Swimming | 1996 Summer, 2000 Summer | |
| Valery Ushkov | Russia | Sailing | 2004 Summer | |
| Gloria Usieta | Nigeria | Football | 2000 Summer | |
| Gemma Usieto | Spain | Shooting | 1988 Summer, 1992 Summer, 1996 Summer | |
| Maria Usifo | Nigeria | Athletics | 1984 Summer, 1988 Summer | |
| Veljko Uskoković | Serbia and Montenegro, Montenegro | Water polo | 1996 Summer, 2000 Summer, 2008 Summer | |
| Yana Uskova | Russia | Handball | 2008 Summer | |
| Binnaz Uslu | Turkey | Athletics | 2004 Summer, 2012 Summer | |
| Sadri Usluoğlu | Basketball | 1936 Summer | |
| Polen Uslupehlivan | Volleyball | 2012 Summer | |
| Muhammed Usman Edu | Nigeria | Football | 2016 Summer | |
| Mariam Usman | Weightlifting | 2008 Summer, 2012 Summer, 2016 Summer | |
| Muhammad Usman | Pakistan | Field hockey | 1996 Summer | |
| Catalina Usme | Colombia | Football | 2012 Summer, 2016 Summer, 2024 Summer | |
| Bakhodur Usmonov | Tajikistan | Boxing | 2020 Summer, 2024 Summer | |
| Ruth Usoro | Nigeria | Athletics | 2024 Summer | |
| Alexandre Usov | Belarus | Road cycling | 2004 Summer, 2008 Summer | |
| Ivan Usov | Russia | Swimming | 2004 Summer | |
| Roman Usov | Athletics | 2004 Summer | |
| Sergey Usov | Unified Team | 1992 Summer | |
| Maya Usova | Unified Team, Russia | Figure skating | 1992 Winter, 1994 Winter | |
| Ilona Usovich | Belarus | Athletics | 2004 Summer, 2008 Summer, 2012 Summer | |
| Sviatlana Usovich | 2004 Summer, 2008 Summer, 2012 Summer | |
| Luis Usoz | Spain | Field hockey | 1960 Summer, 1964 Summer | |
| Pablo Usoz | 1992 Summer, 1996 Summer, 2000 Summer | |
| Galymzhan Usserbayev | Kazakhstan | Wrestling | 2016 Summer | |
| Richard Ussher | New Zealand | Freestyle skiing | 1998 Winter | |
| Johannes Ussing [ Wikidata ] | Denmark | Modern pentathlon | 1912 Summer | |
| Pierluigi Ussorio | Italy | Shooting | 1992 Summer | |
| Svetlana Ussova | Kazakhstan | Canoe sprint | 2020 Summer | |
| Berkin Usta | Turkey | Alpine skiing | 2022 Winter | |
| Abdulla Ustaoglu | Germany | Shooting | 2004 Summer | |
| Oscar Ustari | Argentina | Football | 2008 Summer | |
| Ruedi Uster | Switzerland | Speed skating | 1964 Winter, 1968 Winter | |
| Dag Usterud | Norway | Sailing | 1984 Summer | |
| Aleksandr Ustinov | Russia | Rowing | 1996 Summer | |
| Viktor Ustinov | Uzbekistan | Athletics | 2000 Summer | |
| Daria Ustinova | Russia, Russian Olympic Committee | Swimming | 2016 Summer, 2020 Summer | |
| Daria Sergeyevna Ustinova | Russian Olympic Committee | 2020 Summer | |
| Natalya Ustinova | Soviet Union | 1964 Summer, 1968 Summer | |
| Sergey Ustiugov | Russia, Russian Olympic Committee | Cross country skiing | 2014 Winter, 2022 Winter | |
| Tetiana Ustiuzhanina | Unified Team, Ukraine | Rowing | 1992 Summer, 1996 Summer, 2000 Summer | |
| Mario Ustolin | Italy | 1948 Summer | |
| Komronshokh Ustopiriyon | Tajikistan | Judo | 2016 Summer, 2020 Summer, 2024 Summer | |
| Michaela Ustorf | West Germany | Artistic gymnastics | 1988 Summer | |
| Stefan Ustorf | Germany | Ice hockey | 1994 Winter, 1998 Winter, 2002 Winter, 2006 Winter | |
| Bettina Ustrowski | Swimming | 1992 Summer | |
| Nida Eliz Üstündağ | Turkey | 2016 Summer | |
| Taner Üstündağ | Alpine skiing | 1992 Winter | |
| Serdar Üstüner | Boxing | 2004 Summer | |
| Jerzy Ustupski | Poland | Rowing | 1936 Summer | |
| Stanisław Ustupski | Nordic combined | 1992 Winter, 1994 Winter | |
| Vasile Usturoi | Belgium | Boxing | 2024 Summer | |
| Iryna Ustymenko | Soviet Union | Swimming | 1972 Summer | |
| Maciej Ustynowicz | Poland | Speed skating | 2006 Winter, 2010 Winter | |
| Evgeny Ustyugov | Russia | Biathlon | 2010 Winter, 2014 Winter | |
| Anna Ustyukhina | Water polo | 2016 Summer | |
| Kintaro Usuda | Japan | Boxing | 1928 Summer | |
| Junichi Usui | Athletics | 1984 Summer, 1988 Summer | |
| Leandro Usuna | Argentina | Surfing | 2020 Summer | |
| Oleksandr Usyk | Ukraine | Boxing | 2008 Summer, 2012 Summer | |
| Constantin Uţă | Romania | Wrestling | 1984 Summer | |
| Pujawati Utama | Indonesia | Judo | 1992 Summer | |
| Joshua Utanga | Cook Islands | Canoe sprint | 2012 Summer | |
| Salamat Utarbayev | Kazakhstan | Judo | 2008 Summer | |
| Gennady Utenkov | Soviet Union | Swimming | 1980 Summer | |
| Almas Uteshov | Kazakhstan | Weightlifting | 2012 Summer | |
| Stefan Uteß | Germany | Canoe sprint | 2000 Summer | |
| S. K. Uthappa | India | Field hockey | 2012 Summer, 2016 Summer | |
| Sunday Uti | Nigeria | Athletics | 1980 Summer, 1984 Summer, 1988 Summer | |
| Gottfried Utiger | Switzerland | 1936 Summer | |
| Teresa Utković | Sweden | Handball | 2008 Summer | |
| Géza Ütő | Hungary | Rowing | 1956 Summer | |
| Shunpei Uto | Japan | Swimming | 1936 Summer | |
| Donny Utomo | Indonesia | 2004 Summer, 2008 Summer | |
| Beatrice Utondu | Nigeria | Athletics | 1992 Summer | |
| Jussi Utriainen | Finland | 2004 Summer, 2012 Summer | |
| Sanni Utriainen | 2012 Summer, 2016 Summer | |
| Ivan Utrobin | Soviet Union | Cross country skiing | 1964 Winter | |
| Reika Utsugi | Japan | Softball | 2000 Summer, 2004 Summer | |
| Rumi Utsugi | Football | 2008 Summer | |
| Hanako Utsumi | Rugby sevens | 2024 Summer | |
| Gunnar Utterberg | Sweden | Canoe sprint | 1964 Summer, 1968 Summer, 1972 Summer | |
| Sven Utterström | Cross country skiing | 1928 Winter, 1932 Winter | |
| Jacqui Uttien | Australia | Road cycling | 1992 Summer | |
| Andrew Utting | Baseball | 2004 Summer | |
| Fred Utton | Canada | Shooting | 1908 Summer | |
| Georg Utz | Germany | Wrestling | 1960 Summer | |
| Einar Utzon-Frank | Denmark | Art competitions | 1932 Summer | |
| Peter Utzschneider | West Germany | Bobsleigh | 1968 Winter, 1972 Winter, 1976 Winter | |
| Jaak Uudmäe | Soviet Union | Athletics | 1980 Summer | |
| Eugen Uuemaa | Estonia | 1924 Summer | |
| Otgonbaataryn Uuganbaatar | Mongolia | Judo | 2016 Summer | |
| Kubanychbek Aibek Uulu [ Wikidata ] | Kyrgyzstan | 2024 Summer | |
| Pentti Uusihauta [ Wikidata ] | Finland | Athletics | 1952 Summer | |
| Markku Uusipaavalniemi | Curling | 2002 Winter, 2006 Winter | |
| Anna Maria Uusitalo | Sweden | Biathlon | 2010 Winter | |
| Mauno Uusivirta | Finland | Road cycling | 1968 Summer, 1972 Summer, 1980 Summer | |
| Tarmo Uusivirta | Boxing | 1980 Summer | |
| Eve Uusmees | Soviet Union | Swimming | 1960 Summer | |
| Aveli Uustalu [ Wikidata ] | Estonia | Cross country skiing | 2022 Winter | |
| Japhet Uutoni | Namibia | Boxing | 2008 Summer | |
| Francisco Uva | Portugal | Fencing | 1952 Summer | |
| Alexander Uvarov | Soviet Union | Ice hockey | 1956 Winter | |
| Pavel Uvarov | Russia | Badminton | 1996 Summer | |
| Pavel Uvarov | Kyrgyzstan | Modern pentathlon | 2004 Summer | |
| Annika Uvehall | Sweden | Swimming | 1980 Summer | |
| Aleksei Uversky | Russia | Football | 1912 Summer | |
| Bruno Uvini | Brazil | 2012 Summer | |
| Eduard Uvíra | Czechoslovakia | Ice hockey | 1984 Winter, 1988 Winter | |
| Cynthia Uwak | Nigeria | Football | 2008 Summer | |
| Elsie Uwamahoro | Burundi | Swimming | 2008 Summer, 2012 Summer, 2016 Summer | |
| Fred Yannick Uwase | Rwanda | Judo | 2012 Summer | |
| Lidwine Umuhoza Uwase [ Wikidata ] | Swimming | 2024 Summer | |
| Andrew Uwe | Nigeria | Football | 1988 Summer | |
| Tufaha Uwihoreye [ Wikidata ] | Rwanda | Fencing | 2024 Summer | |
| Ambroise Uwiragiye | Athletics | 2016 Summer | |
| Megu Uyama | Japan | Trampolining | 2020 Summer | |
| Satoru Uyama | Fencing | 2020 Summer | |
| Samin Uygun | Turkey | Football | 1960 Summer | |
| Antoinette Uys | South Africa | Badminton | 2004 Summer | |
| Mehmet Uysal | Turkey | Wrestling | 1976 Summer | |
| Jochem Uytdehaage | Netherlands | Speed skating | 2002 Winter | |
| Antoine Uyterhoeven | Belgium | Athletics | 1952 Summer | |
| Raymond Uytterhaeghe | France | Wrestling | 1968 Summer | |
| Carlos Uzabeaga | Chile | Boxing | 1924 Summer | |
| Matúš Užák | Slovakia | Short track speed skating | 2002 Winter, 2006 Winter | |
| Towa Uzawa | Japan | Athletics | 2024 Summer | |
| Aleksandra Uzelac | Serbia | Volleyball | 2024 Summer | |
| Marija Uzelac | Yugoslavia | Basketball | 1984 Summer | |
| Ellina Uzhakhova | Kazakhstan | Canoe sprint | 2004 Summer | |
| Birutė Užkuraitytė | Soviet Union | Swimming | 1972 Summer | |
| Iraklı Uznadze | Turkey | Judo | 1996 Summer | |
| Ben Uzoh | Nigeria | Basketball | 2016 Summer | |
| János Uzsoki | Hungary | Athletics | 1996 Summer | |
| Mehmet Uzun | Turkey | Wrestling | 1976 Summer | |
| Dechko Uzunov | Bulgaria | Art competitions | 1936 Summer | |
| Petar Uzunov | Volleyball | 1996 Summer | |