Host cities:
| Athlete | Nation(s) | Sport(s) | Role(s) | Era | Notes |
|---|---|---|---|---|---|
| Karin Janke | ATH | Olympics | 1988 | 0–0–1 1994 Helsinki bronze: 4×400 m relay (competed for Germany) | |
| Tomáš Janků | ATH | Olympics | 1996—2008 | 0–1–0 2006 Göteborg silver: high jump | |
| Wioletta Janowska-Frankiewicz | ATH | Olympics | 2004—2008 | 0–0–2 2006 Göteborg bronze: 3000 m steeplechase (competed as Wioletta Janowska); 2010 Barcelona bronze: 3000 m steeplechase (competed as Wioletta Frankiewicz) | |
| Gunnar Jansson | ATH | Olympics | 1932—1936 | 0–0–1 1934 Torino bronze: hammer throw | |
| Paweł Januszewski | ATH | Olympics | 1996—2000 | 1–0–1 1998 Budapest gold: 400 m hurdles; 2002 München bronze: 400 m hurdles | |
| Helmut Janz | ATH | Olympics / Non-starter | 1956—1960 | 0–0–1 1962 Beograd bronze: 400 m hurdles | |
| Zbigniew Jaremski | ATH | Olympics / Non-starter | 1972—1980 | 0–1–0 1978 Praha silver: 4×400 m relay | |
| Tony Jarrett | ATH | Olympics | 1988—2000 | 0–1–1 1990 Split silver: 110 m hurdles; 1994 Helsinki bronze: 110 m hurdles | |
| Akilles Järvinen | ATH | Olympics / Opening Flagbearer | 1928—1936 | 0–1–0 1934 Torino silver: 400 m hurdles | |
| Matti Järvinen | ATH | Olympics | 1932—1936 | 2–0–0 1934 Torino gold: javelin throw; 1938 Paris gold: javelin throw | |
| Daniela Jaworska | ATH | Olympics | 1968—1972 | 1–0–0 1971 Helsinki gold: javelin throw | |
| Michel Jazy | ATH | Olympics | 1956—1964 | 2–1–0 1962 Beograd gold: 1500 m; 1966 Budapest gold: 5000 m, silver: 1500 m | |
| Danuta Jędrejek | ATH | Olympics / Non-starter | 1972—1976 | 0–0–1 1974 Roma bronze: 4×100 m relay | |
| Marcin Jędrusiński | ATH | Olympics | 2004—2008 | 0–1–0 2006 Göteborg silver: 4×100 m relay | |
| Jaroslava Jehličková | ATH | Olympics | 1968—1972 | 1–0–0 1969 Athina gold: 1500 m | |
| Tatjana Jelača | ATH | Olympics | 2008—2012 | 0–1–0 2014 Zürich silver: javelin throw | |
| Martin Jellinghaus | ATH | Olympics | 1968—1972 | 1–0–1 1969 Athina bronze: 4×400 m relay; 1971 Helsinki gold: 4×400 m relay | |
| David Jenkins | ATH | Olympics | 1972—1980 | 2–2–0 1971 Helsinki gold: 400 m; 1974 Roma gold: 4×400 m relay, silver: 400 m; 1982 Athina silver: 4×400 m relay | |
| Marta Jeschke | ATH | Olympics | 2008—2012 | 0–0–2 2010 Barcelona bronze: 4×100 m relay; 2012 Helsinki bronze: 4×100 m relay | |
| Celina Jesionowska | ATH | Olympics | 1960 | 0–0–1 1958 Stockholm bronze: 4×100 m relay | |
| Olivera Jevtić | ATH | Olympics | 2000—2016 | 0–1–0 2006 Göteborg silver: marathon (competed for Serbia) | |
| Antonio Jiménez | ATH | Olympics | 2004 | 1–0–0 2002 München gold: 3000 m steeplechase | |
| Hinrich John | ATH | Olympics | 1964—1968 | 0–1–0 1966 Budapest silver: 110 m hurdles (competed for West Germany) | |
| Sabine John | ATH | Olympics | 1988 | 0–1–0 1982 Athina silver: heptathlon (competed as Sabine Möbius) | |
| Katarina Johnson-Thompson | ATH | Olympics | 2012—2024 | 0–1–0 2018 Berlin silver: heptathlon | |
| Jade Johnson | ATH | Olympics | 2004—2008 | 0–1–0 2002 München silver: long jump | |
| David Jones | ATH | Olympics | 1960 | 0–0–1 1962 Beograd bronze: 4×100 m relay | |
| Ken Jones | ATH | Olympics | 1948 | 0–1–0 1954 Bern silver: 4×100 m relay | |
| Ron Jones | ATH | Olympics | 1964—1968 | 0–0–1 1962 Beograd bronze: 4×100 m relay | |
| Gré de Jongh | ATH | Olympics | 1948—1952 | 0–1–0 1950 Bruxelles silver: 4×100 m relay | |
| Henry Jonsson | ATH | Olympics | 1936 | 0–1–0 1938 Paris silver: 5000 m | |
| Lennart Jonsson | ATH | Olympics | 1960 | 0–0–1 1958 Stockholm bronze: 4×400 m relay | |
| Winnie Jordan | ATH | Olympics | 1948 | 0–2–0 1946 Oslo silver: 100 m and 200 m | |
| Erik Jørgensen | ATH | Olympics | 1948 | 0–0–1 1946 Oslo bronze: 1500 m | |
| Prudent Joye | ATH | Olympics | 1936 | 1–0–0 1938 Paris gold: 400 m hurdles | |
| Jarosława Jóźwiakowska-Bieda | ATH | Olympics | 1960—1964 | 0–0–1 1966 Budapest bronze: high jump (competed as Jarosława Bieda) | |
| Joanna Jóźwik | ATH | Olympics | 2016—2020 | 0–0–1 2014 Zürich bronze: 800 m | |
| Marie-Laurence Jungfleisch | ATH | Olympics | 2016—2020 | 0–0–1 2018 Berlin bronze: high jump | |
| Stanislav Jungwirth | ATH | Olympics | 1952—1956 | 0–0–1 1954 Bern bronze: 1500 m | |
| Jerzy Juskowiak | ATH | Olympics | 1960 | 0–1–0 1962 Beograd silver: 4×100 m relay | |
| Klaus-Peter Justus | ATH | Olympics | 1972 | 1–0–0 1974 Roma gold: 1500 m | |
| Alberto Juzdado | ATH | Olympics | 1996—2000 | 0–0–1 1994 Helsinki bronze: marathon | |
| Krystyna Kacperczyk | ATH | Olympics | 1972 | 0–0–1 1978 Praha bronze: 4×400 m relay | |
| Gerda van der Kade-Koudijs | ATH | Olympics | 1948 | 2–0–0 1946 Oslo gold: 4×100 m relay and long jump | |
| Pentti Kahma | ATH | Olympics | 1972—1976 | 1–0–0 1974 Roma gold: discus throw | |
| Oleksandr Kaidash | ATH | Olympics | 2000 | 1–0–0 2002 München gold: 4×100 m relay | |
| Jo Kaiser | ATH | Olympics | 1960 | 0–1–0 1958 Stockholm silver: 4×400 m relay | |
| Vera Kalashnikova-Krepkina | ATH | Olympics | 1952—1960 | 2–1–0 1954 Bern gold: 4×100 m relay (competed as Vera Krepkina); 1958 Stockholm gold: 4×100 m relay, silver: 100 m (competed as Vera Krepkina) | |
| Birutė Kalėdienė | ATH | Olympics | 1960—1964 | 0–1–0 1958 Stockholm silver: javelin throw (competed as Birutė Zalogaitytė) | |
| Lauri Kalima | ATH | Olympics | 1936 | 0–0–1 1938 Paris bronze: high jump | |
| Damian Kallabis | ATH | Olympics | 2000 | 1–0–0 1998 Budapest gold: 3000 m steeplechase | |
| Antti Kalliomäki | ATH | Olympics | 1972—1980 | 0–1–0 1978 Praha silver: pole vault | |
| Susanna Kallur | ATH | Olympics | 2004—2016 | 1–0–0 2006 Göteborg gold: 100 m hurdles | |
| Henrik Kalocsai | ATH | Olympics | 1964—1968 | 0–0–1 1966 Budapest bronze: triple jump | |
| Lev Kalyayev | ATH | Olympics | 1952 | 1–0–0 1950 Bruxelles gold: 4×100 m relay | |
| Mujinga Kambundji | ATH | Olympics / Opening Flagbearer | 2012—2024 | 0–0–1 2016 Amsterdam bronze: 100 m | |
| Olga Kaniskina | ATH | Olympics | 2008—2012 | 0–1–0 2006 Göteborg silver: 20 km walk | |
| Bernd Kannenberg | ATH | Olympics | 1972—1976 | 0–1–0 1974 Roma silver: 20 km walk | |
| Gerd Kanter | ATH | Olympics / Closing Flagbearer | 2004—2016 | 0–3–1 2006 Göteborg silver: discus throw; 2012 Helsinki silver: discus throw; 2014 Zürich silver: discus throw; 2016 Amsterdam bronze: discus throw | |
| Anastasiya Kapachinskaya | ATH | Olympics | 2008—2012 | 0–1–0 2002 München silver: 4×400 m relay | |
| Denis Kapustin | ATH | Olympics | 2000 | 1–1–0 1994 Helsinki gold: triple jump; 1998 Budapest silver: triple jump | |
| Nikolay Karasyov | ATH | Olympics | 1964 | 0–1–0 1966 Budapest silver: shot put | |
| Milada Karbanová | ATH | Olympics | 1972—1976 | 0–1–0 1974 Roma silver: high jump | |
| Volha Kardapoltsava | ATH | Olympics | 1996 | 0–1–0 1990 Split silver: 10 km walk (competed for the Soviet Union) | |
| Olli-Pekka Karjalainen | ATH | Olympics | 2000—2008 | 1–0–0 2006 Göteborg gold: hammer throw | |
| Michael Karst | ATH | Olympics | 1976 | 0–0–1 1974 Roma bronze: 3000 m steeplechase | |
| Ossi Karttunen | ATH | Olympics | 1972—1976 | 0–0–1 1974 Roma bronze: 4×400 m relay | |
| Veikko Karvonen | ATH | Olympics | 1952—1956 | 1–1–0 1950 Bruxelles silver: marathon; 1954 Bern gold: marathon | |
| Oleksiy Kasianov | ATH | Olympics | 2008—2016 | 0–1–0 2012 Helsinki silver: decathlon | |
| Šárka Kašpárková | ATH | Olympics | 1992—2004 | 0–1–0 1998 Budapest silver: triple jump (competed for Czech Republic) | |
| Carl Kaufmann | ATH | Olympics | 1960 | 0–1–0 1958 Stockholm silver: 4×400 m relay | |
| Waltraud Kaufmann | ATH | Olympics | 1964 | 0–1–0 1962 Beograd silver: 800 m | |
| Ali Kaya | ATH | Olympics | 2016 | 0–1–1 2014 Zürich bronze: 10000 m; 2016 Amsterdam silver: 10000 m | |
| Aras Kaya | ATH | Olympics | 2016 | 0–1–0 2016 Amsterdam silver: 3000 m steeplechase | |
| Özlem Kaya | ATH | Olympics | 2012—2016 | 0–0–1 2016 Amsterdam bronze: 3000 m steeplechase | |
| Hanna Kazak | ATH | Olympics / Non-starter | 1996—2008 | 0–1–0 2006 Göteborg silver: 4×400 m relay | |
| Olga Kazi | ATH | Olympics | 1960—1964 | 0–0–1 1962 Beograd bronze: 800 m | |
| Piotr Kędzia | ATH | Olympics / Non-starter | 2004—2008 | 0–0–1 2006 Göteborg bronze: 4×400 m relay | |
| Naman Keïta | ATH | Olympics | 2004 | 1–0–1 2002 München bronze: 4×400 m relay; 2006 Göteborg gold: 4×400 m relay | |
| Anastasia Kelesidou | ATH | Olympics | 1996—2004 | 0–0–1 2002 München bronze: discus throw | |
| Martin Keller | ATH | Olympics | 2008 | 0–1–1 2010 Barcelona bronze: 4×100 m relay; 2012 Helsinki silver: 4×100 m relay (ran in heats only) | |
| Franz-Josef Kemper | ATH | Olympics | 1968—1972 | 0–1–0 1966 Budapest silver: 800 m | |
| Kostas Kenteris | ATH | Olympics | 2000 | 1–0–0 2002 München gold: 200 m | |
| Linda Keough | ATH | Olympics | 1988 | 0–0–1 1990 Split bronze: 4×400 m relay | |
| Manfred Kersch | ATH | Olympics | 1936 | 1–0–0 1938 Paris gold: 4×100 m relay | |
| Jukka Keskisalo | ATH | Olympics / Non-starter | 2008—2012 | 1–0–0 2006 Göteborg gold: 3000 m steeplechase | |
| Irina Khabarova | ATH | Olympics | 2000—2004 | 1–0–2 2002 München bronze: 4×100 m relay; 2006 Göteborg gold: 4×100 m relay, bronze: 100 m | |
| Tatsiana Khaladovich | ATH | Olympics | 2016—2020 | 1–0–0 2016 Amsterdam gold: javelin throw | |
| Gulfiya Khanafeyeva | ATH | Olympics | 2012 | 0–1–0 2006 Göteborg silver: hammer throw | |
| Natallia Kharaneka-Mikhnevich | ATH | Olympics | 2004—2012 | 1–0–0 2006 Göteborg gold: shot put (competed as Natallia Kharaneka) | |
| Iryna Khliustava | ATH | Olympics | 2000—2012 | 0–1–0 2006 Göteborg silver: 4×400 m relay (ran in heats only) | |
| Olena Kholosha | ATH | Olympics | 2012 | 0–0–1 2012 Helsinki bronze: high jump | |
| Nataliya Khrushchelyeva | ATH | Olympics | 2004 | 0–2–0 1994 Helsinki silver: 4×400 m relay; 1998 Budapest silver: 4×400 m relay | |
| Hilda Kibet | ATH | Olympics | 2008—2012 | 0–0–1 2010 Barcelona bronze: 10000 m | |
| Vaclavas Kidykas | ATH | Olympics | 1988—2000 | 0–0–1 1986 Stuttgart bronze: discus throw (competed for the Soviet Union) | |
| Ellen Kießling | ATH | Olympics | 1992 | 0–1–0 1990 Split silver: 1500 m (competed for East Germany) | |
| Brian Kilby | ATH | Olympics | 1960—1964 | 1–0–0 1962 Beograd gold: marathon | |
| Richard Kilty | ATH | Olympics | 2016—2024 | 1–0–0 2014 Zürich gold: 4×100 m relay | |
| Bev Kinch | ATH | Olympics | 1988 | 0–0–1 1990 Split bronze: 4×100 m relay | |
| Manfred Kinder | ATH | Olympics | 1960—1968 | 1–2–1 1962 Beograd gold: 4×400 m relay, silver: 400 m (competed for Germany); 1966 Budapest silver: 4×400 m relay, bronze: 400 m (competed for West Germany) | |
| Gisela Kinzel | ATH | Olympics | 1988 | 0–1–0 1986 Stuttgart silver: 4×400 m relay | |
| Wilson Kipketer | ATH | Olympics | 2000—2004 | 1–0–0 2002 München gold: 800 m | |
| Anisya Kirdyapkina | ATH | Olympics | 2012 | 1–0–0 2010 Barcelona gold: 20 km walk | |
| Nikolay Kirov | ATH | Olympics | 1980 | 0–1–0 1982 Athina silver: 1500 m | |
| Joachim Kirst | ATH | Olympics | 1968—1972 | 2–0–0 1969 Athina gold: decathlon; 1971 Helsinki gold: decathlon | |
| Irena Kirszenstein-Szewińska | ATH | Olympics / Administrator | 1964—2018 | 5–1–4 1966 Budapest gold: 200 m, 4×100 m relay, and long jump, silver: 100 m (competed as Irena Kirszenstein); 1971 Helsinki bronze: 200 m (competed as Irena Szewińska); 1974 Roma gold: 100 m and 200 m, bronze: 4×100 m relay (competed as Irena Szewińska); 1978 Praha bronze: 400 m and 4×400 m relay (competed as Irena Szewińska) | |
| Magnus Kirt | ATH | Olympics | 2016 | 0–0–1 2018 Berlin bronze: javelin throw | |
| Linda Kisabaka | ATH | Olympics | 1992—1996 | 0–0–1 1994 Helsinki bronze: 4×400 m relay (ran in heats only) | |
| Vladimir Kishkun | ATH | Olympics | 1976 | 1–0–0 1974 Roma gold: pole vault | |
| Balázs Kiss | ATH | Olympics | 1996 | 0–1–0 1998 Budapest silver: hammer throw | |
| Dániel Kiss | ATH | Olympics | 2008—2012 | 0–0–1 2010 Barcelona bronze: 110 m hurdles | |
| Ulrike Klapezynski-Bruns | ATH | Olympics | 1976—1980 | 0–0–1 1986 Stuttgart bronze: 10000 m (competed as Ulrike Bruns) | |
| Max Klauß | ATH | Olympics | 1972 | 1–0–0 1971 Helsinki gold: long jump | |
| Jolán Kleiber-Kontsek | ATH | Olympics / Non-starter | 1964—1972 | 0–0–1 1962 Beograd bronze: discus throw (competed as Jolán Kontsek) | |
| Peter Klein | ATH | Olympics | 1984—1988 | 0–0–1 1982 Athina bronze: 4×100 m relay | |
| Nadine Kleinert-Schmitt | ATH | Olympics | 2000—2012 | 1–0–0 2012 Helsinki gold: shot put (competed as Nadine Kleinert) | |
| Romuald Klim | ATH | Olympics | 1964—1968 | 1–1–0 1966 Budapest gold: hammer throw; 1969 Athina silver: hammer throw | |
| Inta Kļimoviča | ATH | Olympics | 1976 | 0–0–1 1974 Roma bronze: 4×400 m relay | |
| Margrit Klinger | ATH | Olympics | 1984 | 0–0–1 1982 Athina bronze: 800 m | |
| Darya Klishina | ATH | Olympics | 2016—2020 | 0–0–1 2014 Zürich bronze: long jump | |
| Ewa Kłobukowska | ATH | Olympics | 1964 | 2–1–0 1966 Budapest gold: 100 m and 4×100 m relay, silver: 200 m | |
| Ewelina Klocek-Ptak | ATH | Olympics | 2008—2012 | 0–0–1 2012 Helsinki bronze: 4×100 m relay (competed as Ewelina Ptak) | |
| Carolina Klüft | ATH | Olympics | 2004—2008 | 2–0–0 2002 München gold: heptathlon; 2006 Göteborg gold: heptathlon | |
| Oleksandr Klymenko | ATH | Olympics | 1992—1996 | 1–0–0 1994 Helsinki gold: shot put (competed for Ukraine) | |
| Sergey Klyugin | ATH | Olympics | 2000 | 0–0–1 1998 Budapest bronze: high jump | |
| Svetlana Klyuka | ATH | Olympics | 2008 | 0–1–0 2006 Göteborg silver: 800 m | |
| Andreas Knebel | ATH | Olympics | 1980 | 0–1–0 1982 Athina silver: 400 m | |
| Manfred Knickenberg | ATH | Olympics / Non-starter | 1964—1968 | 0–0–1 1966 Budapest bronze: 4×100 m relay (competed for West Germany) | |
| Sven Knipphals | ATH | Olympics | 2016 | 0–1–1 2014 Zürich silver: 4×100 m relay; 2016 Amsterdam bronze: 4×100 m relay | |
| Silke Knoll | ATH | Olympics | 1988—1996 | 1–1–0 1990 Split silver: 4×100 m relay (competed for West Germany); 1994 Helsinki gold: 4×100 m relay (competed for Germany) | |
| Anna Knoroz | ATH | Olympics | 1996 | 0–0–1 1994 Helsinki bronze: 400 m hurdles | |
| Linda Knowles | ATH | Olympics | 1964 | 0–0–1 1962 Beograd bronze: high jump | |
| Hanna Knyazyeva-Minenko | ATH | Olympics / Opening Flagbearer | 2012—2020 | 0–1–0 2016 Amsterdam silver: triple jump (competed for Israel) | |
| Karsten Kobs | ATH | Olympics | 1996—2004 | 0–0–1 1998 Budapest bronze: hammer throw | |
| Cees Koch | ATH | Olympics | 1960—1964 | 0–1–0 1962 Belgrade silver: discus throw | |
| Marita Koch | ATH | Olympics | 1976—1980 | 6–0–0 1978 Praha gold: 400 m and 4×400 m relay; 1982 Athina gold: 400 m and 4×400 m relay; 1986 Stuttgart gold: 400 m and 4×400 m relay | |
| Gisela Köhler-Birkemeyer | ATH | Olympics | 1956—1960 | 0–0–1 1958 Stockholm bronze: 80 m hurdles (competed as Gisela Birkemeyer) | |
| Hermann Köhler | ATH | Olympics | 1972 | 1–1–0 1971 Helsinki gold: 4×400 m relay; 1974 Roma silver: 4×400 m relay | |
| Fabienne Kohlmann | ATH | Olympics | 2012—2016 | 1–0–0 2010 Barcelona gold: 4×400 m relay | |
| Carsten Köhrbrück | ATH | Olympics | 1992 | 0–1–0 1990 Split silver: 4×400 m relay (competed for West Germany) | |
| Heli Koivula-Kruger | ATH | Olympics | 1996—2004 | 0–1–0 2002 München silver: triple jump | |
| Manfred Kokot | ATH | Olympics | 1972—1976 | 0–1–1 1974 Roma bronze: 4×100 m relay; 1978 Praha silver: 4×100 m relay | |
| Sara Kolak | ATH | Olympics | 2016—2024 | 0–0–1 2016 Amsterdam bronze: javelin throw | |
| Karel Kolář | ATH | Olympics | 1980 | 0–1–1 1978 Praha silver: 400 m, bronze: 4×400 m relay | |
| Asmir Kolašinac | ATH | Olympics | 2008—2020 | 0–0–1 2012 Helsinki bronze: shot put | |
| Lyudmila Kolchanova | ATH | Olympics | 2012 | 1–0–0 2006 Göteborg gold: long jump | |
| Nikolay Kolesnikov | ATH | Olympics | 1976 | 0–0–1 1978 Praha bronze: 4×100 m relay | |
| Nadezhda Kolesnikova-Ilyina | ATH | Olympics | 1972—1976 | 0–0–2 1971 Helsinki bronze: 4×400 m relay (competed as Nadezhda Kolesnikova); 1974 Roma bronze: 4×400 m relay (competed as Nadezhda Kolesnikova) | |
| Yevgeniya Kolodko | ATH | Olympics | 2012 | 0–1–0 2014 Zürich silver: shot put | |
| Amelie Koloska | ATH | Olympics | 1968—1972 | 0–1–0 1971 Helsinki silver: javelin throw | |
| Władysław Komar | ATH | Olympics | 1964—1972 | 0–0–2 1966 Budapest bronze: shot put; 1971 Helsinki bronze: shot put | |
| Lyudmila Kondratyeva | ATH | Olympics | 1980—1988 | 2–0–0 1978 Praha gold: 200 m and 4×100 m relay | |
| Yekaterina Kondratyeva | ATH | Olympics | 2004 | 1–0–0 2006 Göteborg gold: 4×100 m relay (ran in heats only) | |
| Ans Koning | ATH | Olympics | 1948 | 0–0–1 1946 Oslo bronze: javelin throw | |
| Valentin Kononen | ATH | Olympics | 1992—2000 | 0–1–0 1998 Budapest silver: 50 km walk | |
| Yury Konovalov | ATH | Olympics | 1956—1960 | 0–0–1 1958 Stockholm bronze: 4×100 m relay | |
| Nadezhda Konyayeva | ATH | Olympics | 1956 | 0–0–1 1954 Bern bronze: javelin throw | |
| Daria Korczyńska | ATH | Olympics | 2008—2012 | 0–0–2 2010 Barcelona bronze: 4×100 m relay; 2012 Helsinki bronze: 4×100 m relay | |
| Waldemar Korycki | ATH | Non-starter | 1972 | 0–1–0 1971 Helsinki silver: 4×400 m relay | |
| Robert Korzeniowski | ATH | Olympics / Closing Flagbearer | 1992—2004 | 2–0–0 1998 Budapest gold: 50 km walk; 2002 München gold: 50 km walk | |
| Irina Korzhanenko | ATH | Olympics | 1996—2004 | 1–1–0 1998 Budapest silver: shot put; 2002 München gold: shot put | |
| Alexander Kosenkow | ATH | Olympics | 2004—2012 | 0–2–2 2002 München bronze: 4×100 m relay; 2010 Barcelona bronze: 4×100 m relay; 2012 Helsinki silver: 4×100 m relay; 2014 Zürich silver: 4×100 m relay | |
| Väinö Koskela | ATH | Olympics | 1948—1952 | 0–0–1 1950 Bruxelles bronze: 10000 m | |
| Dmitry Kosov | ATH | Olympics | 1992—1996 | 0–0–1 1994 Helsinki bronze: 4×400 m relay (competed for Russia) | |
| Stefka Kostadinova | ATH | Olympics / Administrator | 1988—2025 | 1–0–0 1986 Stuttgart gold: high jump | |
| Dietmar Koszewski | ATH | Olympics | 1992 | 0–0–1 1990 Split bronze: 110 m hurdles (competed for West Germany) | |
| Kalevi Kotkas | ATH | Olympics | 1932—1936 | 1–1–0 1934 Torino gold: high jump; 1938 Paris silver: high jump | |
| Olga Kotlyarova | ATH | Olympics / Non-starter | 1996—2004 | 1–1–1 1998 Budapest silver: 4×400 m relay, bronze: 400 m; 2006 Göteborg gold: 800 m | |
| Tatyana Kotova | ATH | Olympics | 2000—2008 | 1–0–0 2002 München gold: long jump | |
| Karl Kotratschek | ATH | Olympics | 1936 | 0–0–1 1938 Paris bronze: triple jump (competed for Germany) | |
| Kostas Koukodimos | ATH | Olympics | 1992—2000 | 0–0–1 1994 Helsinki bronze: long jump | |
| József Kovács | ATH | Olympics | 1936 | 1–2–0 1934 Torino gold: 110 m hurdles, silver: 4×100 m relay; 1938 Paris silver: 400 m hurdles | |
| József Kovács | ATH | Olympics | 1952—1960 | 0–1–0 1954 Bern silver: 10000 m | |
| Liudmyla Kovalenko | ATH | Olympics | 2012 | 0–1–0 2012 Helsinki silver: 5000 m | |
| Yoann Kowal | ATH | Olympics | 2012—2016 | 1–0–1 2014 Zürich gold: 3000 m steeplechase; 2016 Amsterdam bronze: 3000 m steeplechase | |
| Władysław Kozakiewicz | ATH | Olympics | 1976—1980 | 0–1–0 1974 Roma silver: pole vault | |
| Gerda Kraan | ATH | Olympics | 1960—1964 | 1–0–0 1962 Beograd gold: 800 m | |
| Katrin Krabbe | ATH | Olympics | 1988 | 3–0–0 1990 Split gold: 100 m, 200 m, and 4×100 m relay | |
| Oleh Kramarenko | ATH | Olympics | 1996 | 0–1–0 1994 Helsinki silver: 4×100 m relay | |
| Frédéric Krantz | ATH | Olympics | 2000—2004 | 0–1–0 1998 Budapest silver: 4×100 m relay | |
| Vladimir Krasnov | ATH | Olympics | 2012 | 1–1–0 2010 Barcelona gold: 4×400 m relay; 2014 Zürich silver: 4×400 m relay | |
| Jarmila Kratochvílová | ATH | Olympics | 1980 | 0–2–0 1982 Athina silver: 400 m and 4×400 m relay | |
| Guido Kratschmer | ATH | Olympics | 1976—1984 | 0–0–1 1974 Roma bronze: decathlon | |
| Andrei Krauchanka | ATH | Olympics | 2008 | 1–0–1 2010 Barcelona bronze: decathlon; 2014 Zürich gold: decathlon | |
| Gesa Felicitas Krause | ATH | Olympics | 2012—2024 | 2–0–1 2012 Helsinki bronze: 3000 m steeplechase; 2016 Amsterdam gold: 3000 m steeplechase; 2018 Berlin gold: 3000 m steeplechase | |
| Käthe Krauß | ATH | Olympics | 1936 | 1–2–0 1938 Wien gold: 4×100 m relay, silver: 100 m and 200 m | |
| Inesa Kravets | ATH | Olympics | 1988—1996 | 0–1–1 1994 Helsinki silver: long jump, bronze: triple jump (competed for Ukraine) | |
| Łukasz Krawczuk | ATH | Olympics | 2016 | 0–1–1 2014 Zürich bronze: 4×400 m relay; 2016 Amsterdam silver: 4×400 m relay | |
| Nataliya Kresova-Rusakova | ATH | Olympics | 2004—2012 | 1–0–2 2006 Göteborg gold: 4×100 m relay, bronze: 200 m (competed as Nataliya Rusakova); 2014 Zürich bronze: 4×100 m relay (competed as Nataliya Rusakova) | |
| Ingrid Kristiansen | ATH | Olympics | 1984—1988 | 1–0–1 1982 Athina bronze: marathon; 1986 Stuttgart gold: 10000 m | |
| Svetlana Krivelyova | ATH | Olympics | 1992—2004 | 0–0–1 2002 München bronze: shot put (competed for Russia) | |
| Mikhail Krivonosov | ATH | Olympics | 1952—1956 | 1–1–0 1954 Bern gold: hammer throw; 1958 Stockholm silver: hammer throw | |
| Antonina Krivoshapka | ATH | Olympics | 2012 | 0–0–1 2010 Barcelona bronze: 400 m | |
| Ladislav Kříž | ATH | Olympics | 1972 | 1–0–1 1969 Athina bronze: 4×100 m relay; 1971 Helsinki gold: 4×100 m relay | |
| Sonja Krolik-Oberem | ATH | Olympics | 1996—2000 | 0–0–1 2002 München bronze: marathon (competed as Sonja Oberem) | |
| Anne Kroniger | ATH | Olympics | 1972—1976 | 0–1–0 1974 Roma silver: 4×100 m relay | |
| Kazimierz Kropidłowski | ATH | Olympics | 1956—1960 | 0–1–0 1958 Stockholm silver: long jump | |
| Barbara Krug | ATH | Olympics | 1980 | 1–0–0 1978 Praha gold: 4×400 m relay | |
| Eric Krüger | ATH | Olympics | 2012 | 0–0–1 2012 Helsinki bronze: 4×400 m relay | |
| Jutta Krüger | ATH | Olympics | 1952 | 0–0–1 1958 Stockholm bronze: javelin throw (competed as Jutta Neumann) |