El Salvador first competed in the Olympic Games at the 1968 Summer Olympics in Mexico City, Mexico. It has participated in every Games of the Olympiad since that time, excluding those held in 1976 and 1980, when the nation joined the American-led boycott in protest of the Soviet invasion of Afghanistan. The nation has never participated in the Olympic Winter Games and has not earned a medal at any Games of the Olympiad.
Birgit Koschischek is an Austrian swimmer, who specialized in sprint freestyle and butterfly events. She is a two-time Olympian, a four-time Austrian long and short course record holder, and a member of Schwechat Swimming Club in Schwechat, under her personal coach Adam Thoroczkay.
Choi Hye-Ra is a South Korean swimmer, who specialized in butterfly and individual medley events. She collected four medals in the 200 m butterfly, 200 m individual medley, and the 800 m freestyle relay at the 2006 Asian Games in Doha, Qatar, and at the 2010 Asian Games in Guangzhou, China. She also won a silver medal in the same medley distance at the 2011 Summer Universiade in Shenzhen, China, with a time of 2:14.17. She is a resident athlete of Osan Sports Club in Seoul.
Mathieu Fonteyn is a Belgian former swimmer, who specialized in freestyle and butterfly events. He represented his nation Belgium at the 2008 Summer Olympics, placing himself among the top 20 swimmers with an illustrious Belgian record in the 200 m butterfly. Fonteyn trained under the tutelage of the national team's assistant coach Rik Valcke at a local swimming club in Bruges until his abrupt retirement shortly before London 2012 due to sustained injuries.
José Emmanuel Crescimbeni Barrantes is an American-born competition swimmer who has represented Peru in international events, specializing in the butterfly. He represented his parents' homeland Peru at the 2008 Summer Olympics and has currently owned Peruvian records in both the 100 and 200 m butterfly. While residing in the United States, Crescimbeni claimed the 2007 Florida High School state championship title in his signature events, and later served as a member of the Florida Gators swimming and diving team under head coach Gregg Troy.
Ellen Lendra Hight is a Zambian swimmer, who specialized in freestyle and butterfly events. She represented her nation Zambia in two editions of the Olympic Games.
Daniel William Henry "Danny" Wong Bego, OLY is a Malaysian swimmer, who specialises in freestyle and butterfly events. He emerged as one of Malaysia's most promising and outstanding swimmers, winning a total of fifteen medals at the Southeast Asian Games, and breaking six national records. He was the first Malaysian swimmer to compete in three different events at a single Olympic Games.
Loren Yamilé Bahamonde Cabello is an Ecuadorian swimmer, who specialized in freestyle and butterfly events. She represented her nation Ecuador at the 2008 Summer Olympics, and has won a career total of three bronze medals in a major international competition, spanning the two editions of the South American Games. Moreover, she collected a total of sixteen national records in three freestyle events.
Saori Haruguchi is a Japanese swimmer, who specialized in butterfly and individual medley events. She represented her nation Japan at the 2008 Summer Olympics, placing herself among the top 30 swimmers in the 400 m individual medley. On that same year, Haruguchi became the first ever swimming champion in the university's history, when she posted a meet record of 1:52.39 to take the 200 m butterfly title at the NCAA Division I Swimming and Diving Championships in Columbus, Ohio. Haruguchi is a member of the swimming team for Oregon State Beavers, and a graduate of human development and family science at Oregon State University in Corvallis, Oregon.
Micha (Kathrine) Østergaard is a Danish former swimmer, who specialized in 100 & 200 m butterfly.
Tetyana Valentynivna Khala is a Ukrainian swimmer, who specialized in butterfly events. She represented her nation Ukraine at the 2008 Summer Olympics, finishing in the top 30 of the women's 200 m butterfly.
Katalin Bor is a Hungarian swimmer, who specialized in breaststroke events. She represented her nation Hungary at the 2008 Summer Olympics, and has won a career total of two medals in a major international competition, spanning the 2006 European Junior Swimming Championships in Palma de Mallorca, Spain.
Norbert Kovács is a Hungarian swimmer, who specialized in freestyle and butterfly events. He represented his nation Hungary at the 2008 Summer Olympics, and has won a bronze medal in the 200 m butterfly at the 2006 European Junior Swimming Championships in Palma de Mallorca, Spain with a time of 2:00.20. Kovacs is a member of the swimming team for Kőbánya Sport Club in Budapest, under the tutelage of head coach Zsigmond Gyenge.
Dominik Straga is a Croatian swimmer, who specialized in freestyle and butterfly events. He represented his nation Croatia at the 2008 Summer Olympics and has claimed multiple Croatian championship titles and three national records in the long and short course freestyle, and butterfly. He also won two bronze medals in the same stroke at the 2006 European Junior Swimming Championships in Palma de Mallorca, Spain, with respective times of 24.62 and 54.51.
Andrés José González is an Argentine swimmer, who specialized in butterfly events. He represented his nation Argentina at the 2008 Summer Olympics, and eventually captured a bronze medal in the 200 m butterfly at the 2010 South American Games in Medellin, Colombia.
Eduardo Germán Otero is an Argentine former swimmer, who specialized in backstroke and butterfly events. He is a three-time Olympian, a multiple-time national record holder, and a two-time champion for the 50 m backstroke at the South American Games. He is also a member of Club Nadadores del Rio Plata, and is coached and trained by Marcelo "Yuri" Quaglia.
Alexis Márquez Rivas is a Venezuelan swimmer, who specialized in butterfly events. He represented his nation Venezuela at the 2008 Summer Olympics, and currently holds a short course Venezuelan record in the 200 m butterfly (1:59.77) at the 2011 Copa de España Clubes Segunda Division in Castellón de la Plana, Spain.
Magali Rousseau is a French swimmer, who specialized in butterfly events. She represented her nation France in the 200 m butterfly at the 2008 Summer Olympics, and has been a member of Canet 66 in Canet-en-Roussillon throughout her swimming career under the tutelage of her coach Philippe Lucas. Rousseau is the daughter of three-time Olympic freestyle swimmer Michel Rousseau.
Javier Hernández Maradiaga is a Honduran swimmer, who specialized in butterfly events. He represented his nation Honduras at the 2008 Summer Olympics, and has currently owned a Central American record in the 200 m butterfly. Hernandez also spent his college career in the United States as a member of the Lindenwood Lions swimming and diving team under head coach Craig Penrose while pursuing his major in computer science at Lindenwood University in St. Charles, Missouri.
Heather Brand is a Zimbabwean swimmer, who specialised in freestyle and butterfly events. Brand had claimed a total of five medals at the 2007 All-Africa Games in Algiers, Algeria, and eventually represented her nation Zimbabwe in the 100 m butterfly at the 2008 Summer Olympics. Apart from her medal treasury, Brand also established five long and short-course national records in all butterfly events at a major international competition, spanning three editions of the World Championships.
Uruguay 
