Host cities:
| Athlete | Nation(s) | Sport(s) | Role(s) | Era | Notes |
|---|---|---|---|---|---|
| Stanisław Jaskułka | POL |
ATH | Olympics | 1980 | 0–0–1 1985 Kobe ATH bronze: long jump |
| Jatyr | BRA |
BKB | Olympics | 1960—1964 | 1–0–0 1963 Porto Alegre BAS gold |
| Daniela Jaworska | POL |
ATH | Olympics | 1968—1972 | 1–0–0 1970 Torino ATH gold: javelin throw |
| Dorota Jędrusińska | POL |
ATH | Olympics | 2008 | 0–1–0 2009 Beograd ATH silver: 4×100 m relay |
| Otylia Jędrzejczak | POL |
SWM | Olympics | 2000—2012 | 3–0–0 2005 İzmir SWI gold: 200 m freestyle, 100 m butterfly, and 200 m butterfly |
| Jaime Jeffersón | CUB |
ATH | Olympics | 1992—1996 | 2–0–0 1985 Kobe ATH gold: long jump; 1989 Duisburg ATH gold: long jump |
| Thomas Jefferson | USA |
ATH | Olympics | 1984 | 0–0–1 1985 Kobe ATH bronze: 4×100 m relay |
| Martin Jellinghaus | FRG |
ATH | Olympics | 1968—1972 | 0–1–0 1970 Torino ATH silver: 400 m |
| David Jenkins | GBR |
ATH | Olympics | 1972—1980 | 0–1–1 1973 Moskva ATH silver: 4×400 m relay, bronze: 400 m |
| Toby Jenkins | AUS |
WPO | Olympics | 2004 | 0–0–1 2003 Daegu WAP bronze |
| Shelly Jenneke | AUS |
ATH | Olympics / YOG | 2010—2016 | 0–0–1 2015 Gwangju ATH bronze: 100 m hurdles |
| Gary Jennings | GBR |
ATH | Olympics | 1996 | 0–0–1 1995 Fukuoka ATH bronze: 4×400 m relay |
| Terrence Jennings | USA |
TKW | Olympics | 2012 | 0–0–1 2009 Beograd TKW bronze: featherweight -67 kg |
| Annemette Jensen | DEN |
ATH | Olympics | 2004 | 0–0–1 1999 Palma de Mallorca ATH bronze: 10000 m |
| Jeon Hui-Suk | KOR |
FEN | Olympics | 2012—2020 | 0–1–1 2009 Beograd FEN bronze: foil team; 2011 Shenzhen FEN silver: foil |
| Jeon Ji-Hui | KOR |
TTE | Olympics | 2016—2020 | 4–0–3 2015 Gwangju TTN gold: mixed doubles, bronze: doubles and team; 2017 Taipei TTN gold: singles, mixed doubles, and team, bronze: doubles |
| Jeong Bo-Gyeong | KOR |
JUD | Olympics | 2016 | 1–2–1 2015 Gwangju JUD gold: extra-lightweight -48 kg, silver: team; 2017 Taipei JUD silver: team, bronze: extra-lightweight -48 kg |
| Jeong Da-Un | KOR |
JUD | Olympics | 2012 | 1–1–0 2009 Beograd JUD silver: team; 2013 Kazan JUD gold: team |
| Jeong Dong-Ho | KOR |
FBL | Non-starter | 2012 | 0–1–0 2015 Gwangju FTB silver |
| Jeong Gil-Ok | KOR |
FEN | Olympics | 2008—2012 | 0–1–1 2003 Daegu FEN silver: foil team, bronze: foil |
| Jeong Gyeong-Mi | KOR |
JUD | Olympics | 2008—2012 | 0–2–1 2009 Beograd JUD silver: half-heavyweight -78 kg and team; 2011 Shenzhen JUD bronze: half-heavyweight -78 kg |
| Jeong Ji-Hyeon | KOR |
WRE | Olympics | 2004—2012 | 0–1–0 2005 İzmir WRE silver: Greco-Roman welterweight -66 kg |
| Jeong Jin-Su | KOR |
GAR | Olympics | 1992—2000 | 1–2–1 1995 Fukuoka GYM gold: parallel bars, silver: all-around, bronze: floor; 1999 Palma de Mallorca GYM silver: parallel bars |
| Jeong Seon-Yong | KOR |
JUD | Olympics / Non-Medal | 1988—1996 | 1–0–1 1995 Fukuoka JUD gold: team, bronze: lightweight -56 kg |
| Jeong Seong-Suk | KOR |
JUD | Olympics | 1996—2000 | 2–0–0 1995 Fukuoka JUD gold: half-middleweight -61 kg and team |
| Jeong Seul-Gi | KOR |
SWM | Olympics | 2008 | 1–0–0 2007 Bangkok SWI gold: 200 m breaststroke |
| Daniel Jérent | FRA |
FEN | Olympics | 2016 | 1–0–0 2013 Kazan FEN gold: épée team |
| Harry Jerome | CAN |
ATH | Olympics | 1960—1968 | 0–0–1 1965 Budapest ATH bronze: 100 m |
| Marta Jeschke | POL |
ATH | Olympics | 2008—2012 | 0–1–0 2009 Beograd ATH silver: 4×100 m relay |
| Marko Jevtović | SRB |
TTE | Olympics | 2012—2020 | 0–0–1 2009 Beograd TTN bronze: doubles |
| Jaromír Ježek | CZE |
JUD | Olympics | 2008—2016 | 0–0–1 2009 Beograd JUD bronze: half-middleweight -81 kg |
| Zdravko Ježić | CRO YUG |
WPO | Olympics | 1952—1960 | 1–0–0 1959 Torino WAP gold |
| Ji Kyong-Sun | PRK |
JUD | Olympics | 2000 | 0–1–0 2003 Daegu JUD silver: half-middleweight -63 kg |
| Ji Sang-Jun | KOR |
SWM | Olympics | 1992—1996 | 1–0–1 1995 Fukuoka SWI gold: 200 m backstroke; 1997 Catania SWI bronze: 200 m backstroke |
| Ji Wei | CHN |
ATH | Olympics | 2008 | 0–1–0 2007 Bangkok ATH silver: 110 m hurdles |
| Jiang Shuai | CHN |
FBL | Non-starter | 2008 | 0–1–1 2003 Daegu FTB bronze; 2005 İzmir FTB silver |
| Jiang Yuyuan | CHN |
GAR | Olympics | 2008 | 3–2–0 2009 Beograd GYM gold: all-around, balance beam, and team, silver: floor and uneven bars |
| Sutiya Jiewchaloemmit | THA |
SHO | Olympics | 2008—2020 | 0–1–0 2007 Bangkok SHO silver: skeet |
| Iveri Jikurauli | GEO |
JUD | Olympics | 2000—2004 | 0–0–1 1999 Palma de Mallorca JUD bronze: half-heavyweight -100 kg |
| Anacleto Jiménez | ESP |
ATH | Olympics | 1996 | 1–0–0 1987 Zagreb ATH gold: 5000 m |
| Jin Jun-Tak | KOR |
VVO | Olympics | 1972 | 0–0–1 1970 Torino VOL bronze |
| Jin Ling | CHN |
ATH | Olympics | 1988 | 0–0–1 1989 Duisburg ATH bronze: high jump |
| Jin Xiaomei | CHN |
FBL | Olympics | 2004 | 0–0–1 2003 Daegu FTB bronze |
| Kenjiro Jitsui | JPN |
ATH | Olympics | 1996 | 0–1–0 1991 Sheffield ATH silver: marathon |
| Jo Bun-Hui | PRK |
ATH | Olympics | 2004—2008 | 0–1–1 2003 Daegu ATH silver: half marathon; 2007 Bangkok ATH bronze: 10000 m |
| Jo Eun-Ji | KOR |
HOC | Non-starter | 2012 | 1–0–0 2013 Kazan HOK gold |
| Jo Gu-Ham | KOR |
JUD | Olympics | 2016—2020 | 2–2–0 2013 Kazan JUD gold: heavyweight +100 kg and team; 2015 Gwangju JUD gold: half-heavyweight -100 kg, silver: team |
| Jo Hyeon-Ju | KOR |
GAR | Olympics | 2008 | 1–0–0 2011 Shenzhen GYM gold: vault |
| Jo In-Cheol | KOR |
JUD | Olympics | 1996—2000 | 1–1–0 1995 Fukuoka JUD gold: team, silver: half-middleweight -78 kg |
| Jo Jae-Hak | KOR |
VVO | Olympics | 1976 | 0–0–1 1970 Torino VOL bronze |
| Jo Jun-Ho | KOR |
JUD | Olympics | 2012 | 1–0–0 2009 Beograd JUD gold: team |
| Jo Min-Seon | KOR |
JUD | Olympics / Non-Medal | 1988—2000 | 2–0–0 1995 Fukuoka JUD gold: middleweight -66 kg and team |
| Jo Seong-Min | KOR |
GAR | Olympics | 1996—2004 | 0–1–2 1997 Catania GYM silver: floor, bronze: horse vault; 1999 Palma de Mallorca GYM bronze: horse vault |
| Jo Yeong-Gwang | KOR |
GAR | YOG | 2010 | 0–1–0 2015 Gwangju GYM silver: team |
| Michał Joachimowski | POL |
ATH | Olympics | 1972—1976 | 1–0–0 1975 Roma ATH gold: triple jump |
| Anaso Jobodwana | RSA |
ATH | Olympics | 2012—2020 | 2–0–0 2013 Kazan ATH gold: 100 m and 200 m |
| Rafael Jofresa | ESP |
BKB | Olympics | 1992 | 0–0–1 1987 Zagreb BAS bronze |
| Thorsten Johansson | SWE |
ATH | Olympics | 1976 | 0–0–1 1975 Roma ATH bronze: 200 m |
| Brian Johns | CAN |
SWM | Olympics | 2000—2008 | 1–1–2 2007 Bangkok SWI gold: 200 m medley, silver: 4×100 m freestyle relay, bronze: 200 m freestyle; 2009 Beograd SWI bronze: 4×200 m freestyle relay |
| Ben Johnson | CAN |
ATH | Olympics | 1984—1992 | 0–1–0 1983 Edmonton ATH silver: 4×100 m relay |
| Dave Johnson | USA |
ATH | Olympics | 1988—1992 | 1–0–0 1989 Duisburg ATH gold: decathlon |
| David Johnson | USA |
SWM | Olympics | 1968 | 3–0–0 1973 Moskva SWI gold: 100 m backstroke, 200 m backstroke, and 4×100 m medley relay |
| Jenna Johnson | USA |
SWM | Olympics | 1984 | 1–1–0 1985 Kobe SWI gold: 4×100 m medley relay, silver: 100 m freestyle |
| Lawrence Johnson | USA |
ATH | Olympics | 1996—2000 | 0–1–0 1995 Fukuoka ATH silver: pole vault |
| Michael Johnson | USA |
ATH | Olympics | 1992—2000 | 0–1–0 1989 Duisburg ATH silver: 4×400 m relay |
| Shannon Johnson | USA |
BKB | Olympics | 2004 | 1–0–0 1997 Catania BAS gold |
| Abby Johnston | USA |
DIV | Olympics | 2012—2016 | 0–0–2 2009 Beograd DIV bronze: synchronized springboard and team |
| Pascal Jolyot | FRA |
FEN | Olympics | 1980—1984 | 0–1–0 1985 Kobe FEN silver: foil team |
| Jon Hyon-Ju | PRK |
DIV | Olympics | 2004 | 0–1–1 2003 Daegu DIV silver: synchronized platform, bronze: team |
| Ildikó Jónás | HUN |
ATH | Olympics | 1960 | 0–0–1 1965 Budapest ATH bronze: 4×100 m relay |
| Carolyn Jones | USA |
BKB | Olympics | 1992 | 1–0–0 1991 Sheffield BAS gold |
| Cullen Jones | USA |
SWM | Olympics | 2008—2012 | 1–0–0 2005 İzmir SWI gold: 50 m freestyle |
| Diane Jones | CAN |
ATH | Olympics | 1972—1976 | 0–0–1 1973 Moskva ATH bronze: pentathlon |
| Esther Jones | USA |
ATH | Olympics | 1992 | 1–0–1 1989 Duisburg ATH gold: 4×100 m relay, bronze: 200 m |
| Roddy Jones | GBR |
SWM | Olympics | 1968 | 0–0–2 1967 Tokyo SWI bronze: 100 m backstroke and 4×100 m medley relay |
| Jong Chun-Hui | PRK |
WLF | YOG | 2014 | 0–0–1 2017 Taipei WLT bronze: light-heavyweight -69 kg |
| Jong Yong-Ok | PRK |
ATH | Olympics | 2000—2008 | 0–0–1 2007 Bangkok ATH bronze: half marathon |
| Maneepong Jongjit | THA |
BDM | Olympics | 2012 | 1–0–2 2011 Shenzhen BDM gold: doubles, bronze: mixed doubles and team |
| Stella Jongmans | NED |
ATH | Olympics | 1992—1996 | 1–0–0 1995 Fukuoka ATH gold: 800 m |
| Abigél Joó | HUN |
JUD | Olympics | 2012—2016 | 1–0–0 2013 Kazan JUD gold: half-heavyweight -78 kg |
| Lars Jorgensen | USA |
SWM | Olympics | 1988 | 0–1–0 1993 Buffalo SWI silver: 800 m freestyle |
| Frédérique Jossinet | FRA |
JUD | Olympics | 2004—2008 | 1–0–2 1999 Palma de Mallorca JUD gold: team, bronze: extra-lightweight -48 kg; 2001 Beijing JUD bronze: extra-lightweight -48 kg |
| Sergėjus Jovaiša | LTU URS |
BKB | Olympics | 1980—1992 | 0–2–0 1977 Sofia BAS silver (competed for the Soviet Union); 1981 București BAS silver (competed for the Soviet Union) |
| Stefan Jović | SRB |
BKB | Olympics | 2016 | 0–0–1 2013 Kazan BAS bronze |
| Bogna Jóźwiak | POL |
FEN | Olympics | 2008—2016 | 0–0–1 2005 İzmir FEN bronze: sabre team |
| Jarosława Jóźwiakowska-Bieda | POL |
ATH | Olympics | 1960—1964 | 0–0–1 1959 Torino ATH bronze: high jump (competed as Jarosława Jóźwiakowska) |
| Urszula Jóźwik | POL |
ATH | Olympics | 1968—1972 | 0–1–0 1973 Moskva ATH silver: 4×100 m relay |
| Ju Hui | KOR |
HBL | Olympics | 2012—2020 | 0–1–0 2015 Gwangju HAN silver |
| Ju Se-Hyeok | KOR |
TTE | Olympics | 2004—2016 | 0–1–1 2001 Beijing TTN silver: doubles, bronze: team |
| Alberto Juantorena | CUB |
ATH | Olympics | 1972—1980 | 2–0–0 1973 Moskva ATH gold: 400 m; 1977 Sofia ATH gold: 800 m |
| Mirna Jukic | AUT |
SWM | Olympics | 2004—2008 | 0–0–1 2007 Bangkok SWI bronze: 100 m breaststroke |
| Arsen Julfalakyan | ARM |
WRE | Olympics / Other | 2008—2016 | 0–0–1 2013 Kazan WRE bronze: Greco-Roman middleweight -74 kg |
| Ronald Julião | BRA |
ATH | Olympics | 2012 | 1–0–1 2011 Shenzhen ATH bronze: discus throw; 2013 Kazan ATH gold: discus throw |
| Leigh Julius | RSA |
ATH | Olympics | 2004—2008 | 2–3–1 2003 Daegu ATH gold: 200 m, silver: 100 m; 2005 İzmir ATH gold: 200 m; 2007 Bangkok ATH silver: 200 m and 4×100 m relay; 2009 Beograd ATH bronze: 4×100 m relay |
| Sherali Juraev | UZB |
JUD | Olympics | 2016 | 0–1–0 2011 Shenzhen JUD silver: middleweight -90 kg |
| Radek Juška | CZE |
ATH | Olympics | 2016 | 1–0–0 2017 Taipei ATH gold: long jump |
| Vazha K'ach'arava | GEO URS |
VVO | Olympics | 1964 | 1–0–0 1963 Porto Alegre VOL gold |
| Teimuraz K'ak'ulia | GEO URS |
TEN | Non-Medal | 1968 | 3–0–0 1973 Moskva TEN gold: singles, doubles, and mixed doubles |
| Aleksandr Kabanov | RUS URS |
WPO | Olympics / Coach | 1972—2012 | 2–0–0 1970 Torino WAP gold; 1973 Moskva WAP gold |
| Lina Kačiušytė | LTU URS |
SWM | Olympics | 1980 | 1–0–2 1981 București SWI gold: 200 m breaststroke, bronze: 100 m breaststroke, bronze: 4×100 m medley relay |
| Jerzy Kaczmarek | POL |
FEN | Olympics | 1972 | 0–2–0 1970 Torino FEN silver: foil team; 1973 Moskva FEN silver: foil team |
| Tomasz Kaczor | POL |
CSP | Olympics | 2012—2016 | 0–0–2 2013 Kazan CAN bronze: C2 500 m and C2 1000 m |
| Oleksandr Kaidash | UKR |
ATH | Olympics | 2000 | 0–1–0 2001 Beijing ATH silver: 4×400 m relay |
| Natasha Kaiser-Brown | USA |
ATH | Olympics | 1992 | 1–0–0 1989 Duisburg ATH gold: 4×400 m relay |
| Masaki Kaito | JPN |
VVO | Olympics | 1988 | 1–0–0 1985 Kobe VOL gold |
| Hiroshi Kajiyama | JPN |
GAR | Olympics | 1976 | 2–6–1 1973 Moskva GYM silver: floor, pommelled horse, and team; 1977 Sofia GYM gold: all-around and floor, silver: parallel bars, horizontal bar, and team, bronze: pommelled horse |
| Siarhei Kalamoyets | BLR |
ATH | Olympics | 2016 | 0–0–1 2015 Gwangju ATH bronze: hammer throw |
| Valter Kalaus | HUN |
SWM | Olympics | 1988 | 0–0–1 1993 Buffalo SWI bronze: 400 m freestyle |
| Murat Kalikulov | UZB |
JUD | Olympics | 2004 | 0–1–0 2001 Beijing JUD silver: half-lightweight -66 kg |
| Nikola Kalinić | SRB |
BKB | Olympics | 2016 | 0–0–1 2013 Kazan BAS bronze |
| Irina Kalinina | RUS URS |
DIV | Olympics | 1976—1980 | 3–1–0 1977 Sofia DIV gold: 3 m springboard and platform; 1979 Ciudad de México DIV gold: 3 m springboard, silver: platform |
| Volodymyr Kaliuzhnyi | UKR |
FEN | Olympics | 1996—2004 | 0–0–2 1991 Sheffield FEN bronze: sabre team (competed for the Soviet Union); 1997 Catania FEN bronze: sabre team |
| János Kalmár | HUN USA |
FEN | Olympics / Referee | 1968—1984 | 1–0–0 1965 Budapest FEN gold: sabre team |
| Mantas Kalnietis | LTU |
BKB | Olympics | 2012—2016 | 1–0–0 2007 Bangkok BAS gold |
| Henrik Kalocsai | HUN |
ATH | Olympics | 1964—1968 | 1–0–0 1965 Budapest ATH gold: triple jump |
| Athanasios Kalogiannis | GRE |
ATH | Olympics | 1984—1992 | 0–1–0 1987 Zagreb ATH silver: 400 m hurdles |
| Lesia Kalytovska | UKR |
CTR | Olympics | 2008—2012 | 1–1–0 2011 Shenzhen CYC gold: points race, silver: 3000 m individual pursuit |
| Bayano Kamani | PAN |
ATH | Olympics / Other | 2004—2008 | 0–1–0 1999 Palma de Mallorca ATH silver: 400 m hurdles (competed for the United States) |
| Naoko Kamata | JPN |
SAL | Olympics | 2008 | 0–1–0 2005 İzmir SAI silver: 470 women |
| Sergey Kamensky | ROC RUS |
SHO | Olympics | 2016—2020 | 1–1–3 2011 Shenzhen SHO bronze: 50 m rifle three positions and 50 m rifle three positions team; 2013 Kazan SHO gold: 50 m rifle prone, silver: 10 m air rifle team, bronze: 50 m rifle prone team |
| Valentina Kamenyok-Vinogradova | RUS URS |
VVO | Olympics | 1964—1968 | 1–0–0 1965 Budapest VOL gold (competed as Valentina Vinogradova) |
| Daiki Kamikawa | JPN |
JUD | Olympics | 2012 | 0–1–1 2009 Beograd JUD silver: heavyweight +100 kg, bronze: team |
| Mateusz Kamiński | POL |
CSP | Olympics | 2016—2020 | 0–0–1 2013 Kazan CAN bronze: C4 1000 m |
| Yuya Kamoto | JPN |
GAR | YOG | 2010 | 2–1–1 2015 Gwangju GYM gold: team, silver: parallel bars, bronze: horizontal bar; 2017 Taipei GYM gold: team |
| Maria Kamrowska | POL |
ATH | Olympics | 1992 | 0–0–1 1991 Sheffield ATH bronze: heptathlon |
| Berber Kamstra | NED |
SWM | Olympics | 1976 | 0–1–1 1979 Ciudad de México SWI silver: 4×100 m freestyle relay, bronze: 4×100 m medley relay relay |
| Jenő Kamuti | HUN |
FEN | Olympics / Referee / Other / Administrator | 1960—2000 | 4–3–0 1959 Torino FEN silver: foil team; 1961 Sofia FEN gold: foil and foil team; 1963 Porto Alegre FEN gold: foil, silver: foil team and épée team; 1965 Budapest FEN gold: foil |
| László Kamuti | HUN |
FEN | Olympics | 1960—1972 | 1–1–0 1961 Sofia FEN gold: foil team; 1963 Porto Alegre FEN silver: foil team |
| Andrei Kan | BLR |
GAR | Olympics | 1996 | 2–0–0 1991 Sheffield GYM gold: parallel bars and team (competed for the Soviet Union) |
| Masayoshi Kan | JPN |
ATH | Olympics | 1992 | 0–1–0 1993 Buffalo ATH silver: 4×400 m relay |
| Yevgeniya Kanayeva | RUS |
GRY | Olympics | 2008—2012 | 9–1–0 2009 Beograd RGY gold: individual, ball, hoop, ribbon, and robe; 2011 Shenzhen RGY gold: individual, ball, clubs, and hoop, silver: ribbon |
| Yoko Kando | JPN |
SWM | Olympics | 1992 | 2–2–0 1993 Buffalo SWI gold: 100 m butterfly and 200 m butterfly, silver: 4×100 m medley relay; 1995 Fukuoka SWI silver: 4×100 m medley relay (swam in heats only) |
| Mitsuko Kandori | JPN |
GAR | Olympics | 1968 | 0–1–0 1967 Tokyo GYM silver: all-around |
| Kazuya Kaneda | JPN |
SWM | Olympics | 2012 | 0–1–0 2009 Beograd SWI silver: 200 m butterfly |
| Yuzo Kanemaru | JPN |
ATH | Olympics | 2008—2016 | 1–0–1 2009 Beograd ATH gold: 400 m, bronze: 4×400 m relay |
| Rie Kaneto | JPN |
SWM | Olympics | 2008—2016 | 1–1–0 2007 Bangkok SWI silver: 200 m breaststroke; 2009 Beograd SWI gold: 200 m breaststroke |
| Shunsuke Kaneto | JPN |
DIV | Olympics | 1960—1964 | 3–0–0 1961 Sofia DIV gold: 3 m springboard; 1963 Porto Alegre DIV gold: 3 m springboard and platform |
| Kang Yun-Mi | PRK |
GAR | Olympics | 2004 | 0–1–0 2005 İzmir GYM silver: team |
| Tibor Kangyal | HUN |
BKB | Olympics | 1964 | 0–0–1 1965 Budapest BAS bronze |
| Miyuki Kano | JPN |
VVO | Olympics | 2008 | 0–0–1 1997 Catania VOL bronze |
| Gerd Kanter | EST |
ATH | Olympics / Other | 2004—2016 | 1–0–0 2005 İzmir ATH gold: discus throw |
| Andrey Kapralov | RUS |
SWM | Olympics | 2000—2008 | 2–3–1 2003 Daegu SWI gold: 100 m freestyle and 4×200 m freestyle relay, silver: 4×100 m medley relay, bronze: 50 m freestyle; 2005 İzmir SWI silver: 50 m freestyle and 100 m freestyle |
| Olga Kapranova | RUS |
GRY | Olympics | 2008 | 0–3–0 2007 Bangkok RGY silver: individual, hoop, and ribbon |
| Velik Kapsazov | BUL |
GAR | Olympics | 1956—1964 | 0–0–1 1961 Sofia GYM bronze: all-around |
| Mehmet Serhat Karadağ | TUR |
WRE | Olympics | 1984 | 0–0–1 1977 Sofia WRE bronze: Greco-Roman flyweight -52 kg |
| Nagihan Karadere | TUR |
ATH | Olympics | 2012 | 0–1–1 2011 Shenzhen ATH silver: 4×400 m relay, bronze: 400 m hurdles |
| Ashot Karagyan | ARM URS |
FEN | Olympics | 1980 | 1–0–0 1973 Moskva FEN gold: épée team |
| Yousef Karami | IRI |
TKW | Olympics | 2004—2012 | 1–0–0 2007 Bangkok TKW gold: middleweight -84 kg |
| Andranik Karapetyan | ARM |
WLF | Olympics | 2016 | 0–1–0 2017 Taipei WLT silver: light-heavyweight -85 kg |
| Mariya Karashka | BUL |
GAR | Olympics | 1968 | 0–0–1 1965 Budapest GYM bronze: team |
| Nikolay Karasyov | RUS URS |
ATH | Olympics | 1964 | 0–1–0 1965 Budapest ATH silver: shot put |
| Branislav Karaulić | SRB YUG |
ATH | Olympics | 1988 | 0–1–0 1987 Zagreb ATH silver: 4×400 m relay |
| Elvina Karimova | ROC RUS |
WPO | Olympics | 2016—2020 | 1–0–0 2013 Kazan WAP gold |
| Dmytro Kariuchenko | UKR |
FEN | Olympics | 2004—2016 | 3–0–0 2003 Daegu FEN gold: épée team; 2005 İzmir FEN gold: épée team; 2007 Bangkok FEN gold: épée team |
| Julius Kariuki | KEN |
ATH | Olympics | 1984—1988 | 1–0–0 1989 Duisburg ATH gold: 10000 m |
| Kris Karlson | USA |
ROW | Olympics | 1992 | 0–0–1 1987 Zagreb ROW bronze: lightweight single sculls |
| Raycho Karmadzhiev | BUL |
CSP | Olympics | 1980 | 0–0–1 1987 Zagreb CAN bronze: C1 500 m |
| Anna Karnaukh | ROC RUS |
WPO | Olympics | 2012—2020 | 1–0–0 2013 Kazan WAP gold |
| György Kárpáti | HUN |
SWM/WPO | Olympics / Non-starter | 1952—1964 | 1–1–2 1961 Sofia SWI bronze: 4×100 m freestyle relay and WAP bronze, 1963 Porto Alegre WAP gold, SWI silver: 4×100 m freestyle relay |
| Viktoriya Karpenko | UKR |
GAR | Olympics | 2000 | 0–1–1 1999 Palma de Mallorca GYM silver: team, bronze: uneven bars |
| Svetlana Karpeyeva | RUS |
SWM | Olympics | 2008 | 0–0–3 2007 Bangkok SWI bronze: 200 m medley; 2009 Beograd SWI bronze: 400 m medley and 4×100 m medley relay |
| Yelena Karpova | RUS |
BKB | Olympics | 2004 | 0–0–1 1999 Palma de Mallorca BAS bronze |
| Oleksandra Karpovich | RUS |
WPO | Olympics | 2008 | 0–0–2 2009 Beograd WAP bronze; 2011 Shenzhen WAP bronze |
| Kateryna Karsak | UKR |
ATH | Olympics | 2008—2012 | 0–0–1 2009 Beograd ATH bronze: discus throw |
| Michael Karst | FRG |
ATH | Olympics | 1976 | 1–2–0 1973 Moskva ATH silver: 3000 m steeplechase; 1975 Roma ATH silver: 3000 m steeplechase; 1977 Sofia ATH gold: 3000 m steeplechase |
| Yuji Kasama | JPN |
VVO | Olympics | 1988 | 0–0–1 1981 București VOL bronze |
| Akihiro Kasamatsu | JPN |
GAR | Olympics / Referee | 2000—2020 | 1–0–1 1999 Palma de Mallorca GYM gold: team, bronze: floor |
| Indrek Kaseorg | EST |
ATH | Olympics | 1996—2000 | 0–1–0 1993 Buffalo ATH silver: decathlon |
| Takehiro Kashima | JPN |
GAR | Olympics | 2004—2008 | 2–0–1 2005 İzmir GYM gold: parallel bars and team, bronze: all-around |
| Yury Kashirin | RUS URS |
CRD | Olympics | 1980 | 1–0–0 1983 Edmonton CYC gold: team time trial |
| Tatyana Kashirina | RUS |
WLF | Olympics | 2012 | 1–0–0 2013 Kazan WLT gold: super-heavyweight +75 kg |
| Igor Kashkarov | RUS URS |
ATH | Olympics | 1956 | 0–1–0 1961 Sofia ATH silver: high jump |
| Inna Kashyna | UKR |
ATH | Olympics | 2016 | 2–0–0 2017 Taipei ATH gold: 20 km walk and 20 km walk team |
| Orsolya Kasó | HUN |
WPO | Olympics | 2016 | 0–1–0 2009 Beograd WAP silver |
| Šárka Kašpárková | CZE TCH |
ATH | Olympics | 1992—2004 | 1–1–0 1993 Buffalo ATH silver: triple jump (competed for the Czech Republic); 1995 Fukuoka ATH gold: triple jump (competed for the Czech Republic) |
| Romy Kasper | GER |
CRD | Olympics | 2016 | 0–0–1 2011 Shenzhen CYC bronze: road time trial team |
| Dzmitry Kaspiarovich | BLR |
GAR | Olympics | 2008—2012 | 0–0–1 2001 Beijing GYM bronze: floor |
| Aurore Kassambara | FRA |
ATH | Non-starter | 2008 | 0–2–0 2003 Daegu ATH silver: 4×100 m relay; 2005 İzmir ATH silver: 4×100 m relay |
| Kyoko Kasuya | JPN |
SWM | Olympics | 1992 | 0–0–1 1995 Fukuoka SWI bronze: 200 m breaststroke |
| Renata Katewicz | POL |
ATH | Olympics | 1988—1996 | 1–0–0 1993 Buffalo ATH gold: discus throw |
| Izumi Kato | JPN |
SWM | Olympics | 2012 | 1–0–0 2011 Shenzhen SWI gold: 200 m medley |
| Nobuya Kato | JPN |
ATH | Olympics | 2016 | 0–1–0 2015 Gwangju ATH silver: 4×400 m relay |
| Ryohei Kato | JPN |
GAR | Olympics | 2012—2016 | 1–0–2 2013 Kazan GYM gold: floor, bronze: horizontal bar and team |
| Sawao Kato | JPN |
GAR | Olympics | 1968—1976 | 1–0–1 1967 Tokyo GYM gold: team, bronze: all-around |
| Takeshi Kato | JPN |
GAR | Olympics | 1968 | 2–2–0 1963 Porto Alegre GYM gold: team, silver: all-around; 1967 Tokyo GYM gold: team, silver: all-around |
| Yuka Kato | JPN |
SWM | Olympics | 2008—2012 | 1–1–0 2007 Bangkok SWI gold: 4×100 m medley relay, silver: 50 m butterfly |
| András Katona | HUN |
WPO | Olympics | 1960 | 2–2–2 1959 Torino SWI silver: 4×200 m freestyle relay and WAP silver; 1961 Sofia SWI bronze: 4×100 m freestyle relay and WAP bronze; 1963 Pôrto Alegre WAP gold; 1965 Budapest WAP gold |
| József Katona | HUN |
SWM | Olympics | 1960—1964 | 0–0–1 1965 Budapest SWI bronze: 400 m freestyle |
| István Kausz | HUN |
FEN | Olympics | 1960—1964 | 1–0–1 1959 Torino FEN gold: épée, bronze: épée team |
| Christian Kauter | SUI |
FEN | Olympics / Other | 1968—1976 | 1–0–0 1967 Tokyo FEN gold: épée team |
| Fabian Kauter | SUI |
FEN | Olympics | 2012—2016 | 1–0–2 2007 Bangkok FEN bronze: épée team; 2009 Beograd FEN gold: épée team, bronze: épée |
| Antanas Kavaliauskas | LTU |
BKB | Olympics | 2012—2016 | 1–0–0 2007 Bangkok BAS gold |
| Shingo Kawabata | JPN |
ATH | Olympics | 2000 | 1–0–0 2001 Beijing ATH gold: 4×100 m relay |
| Shunichi Kawai | JPN |
VVO | Olympics | 1984—1988 | 1–0–1 1981 București VOL bronze; 1985 Kobe VOL gold |
| Yukari Kawamoto | JPN |
GRY | Olympics | 1992 | 0–2–0 1991 Sheffield RGY silver: hoop and rope |
| Zygmunt Kawecki | POL |
FEN | Olympics | 1968—1972 | 0–0–1 1965 Budapest FEN bronze: sabre team |
| Özlem Kaya | TUR |
ATH | Olympics | 2012—2016 | 0–0–2 2015 Gwangju ATH bronze: 3000 m steeplechase; 2017 Taipei ATH bronze: 3000 m steeplechase |
| Rıza Kayaalp | TUR |
WRE | Olympics / Other | 2008—2020 | 1–0–0 2013 Kazan WRE gold: Greco-Roman super-heavyweight -120 kg |
| Oliver Kayser | AUT |
FEN | Olympics | 2000 | 0–0–1 1999 Palma de Mallorca FEN bronze: épée team |
| Hanna Kazak | BLR |
ATH | Olympics / Non-starter | 1996—2008 | 0–0–1 2001 Beijing ATH bronze: 4×400 m relay |