| Kapila | Vedic sage, of the Samkhya sc… | |
| Abraham Kaplan | American philosopher | 1918–1993 |
| Helmut F. Kaplan | Austrian philosopher | 1952 |
| Robert D. Kaplan | American writer | 1952 |
| Robert S. Kaplan | American accounting academic | 1940 |
| Philip Kapleau | American Zen Buddhist monk | 1912–2004 |
| Natasha Kaplinsky | English newsreader and report… | 1972 |
| Ioannis Kapodistrias | Greek politician and diplomat… | 1776–1831 |
| Anish Kapoor | British contemporary artist o… | 1954 |
| Ekta Kapoor | TV and film producer | 1975 |
| Shraddha Kapoor | Indian film actress & Singer | 1987 |
| Karl William Kapp | American economist | 1910–1976 |
| Allan Kaprow | American artist | 1927–2006 |
| Ryszard Kapuściński | Polish historian | 1932–2007 |
| Jerome Karabel | American sociologist | 1950 |
| Radovan Karadžić | former Bosnian Serb politicia… | 1945 |
| Herbert von Karajan | Austrian conductor | 1908–1989 |
| Youssef Bey Karam | Lebanese rebel | 1823–1889 |
| Donna Karan | American fashion designer | 1948 |
| Khloé Kardashian | American television personali… | 1984 |
| Allan Kardec | systematizer of Spiritism | 1804–1869 |
| Maulana Karenga | Political activist | 1941 |
| Alar Karis | President of Estonia | 1958 |
| Erik Axel Karlfeldt | Swedish poet | 1864–1931 |
| Boris Karloff | English actor | 1887–1969 |
| Andreas Karlstadt | German theologian | 1486–1541 |
| Tawakkol Karman | Yemeni journalist, politician… | 1979 |
| Theodore von Kármán | Hungarian-American mathematic… | 1881–1963 |
| Girish Raghunath Karnad | Indian playwright | 1938–2019 |
| Dean Karnazes | American distance runner | 1962 |
| Holden Karnofsky | American nonprofit executive | 1981 |
| Alexis Karpouzos | | 1967 |
| Anatoly Karpov | Russian chess player | 1951 |
| Drew Karpyshyn | Author and game designer | 1971 |
| Alphonse Karr | French critic, journalist, an… | 1808–1890 |
| Mary Karr | American writer | 1955 |
| Mehdi Karroubi | Iranian reformist politician,… | 1937 |
| Amani Abeid Karume | Zanzibari politician | 1948 |
| Karunanidhi | Indian politician who has ser… | 1924–2018 |
| Wong Kar-wai | Hong Kong screenwriter, film … | 1958 |
| Hamid Karzai | President of Afghanistan | 1957 |
| Joseph Kasa-Vubu | President of the Democratic R… | 1910–1969 |
| Ernst Käsemann | German theologian | 1906–1998 |
| Félicien Ntambue Kasembe | roman-catholic clergyman | 1970 |
| Daniel Kash | Canadian actor | 1959 |
| Sarmad Kashani | Persian mystic, poet and saint | 1590–1661 |
| Media Kashigar | Iranian translator, writer an… | 1956–2017 |
| Harsha of Kashmir | | |
| John Kasich | American politician and forme… | 1952 |
| Laura Kasischke | American writer | 1961 |
| Garry Kasparov | former chess world champion | 1963 |
| Eugene Kaspersky | Russian specialist in the inf… | 1965 |
| Ahmad Kasravi | Iranian academic | 1890–1946 |
| John Kass | American journalist | 1956 |
| Leon R. Kass | American academic | 1939 |
| Saint Nimatullah Kassab | Lebanese Maronite monk and sa… | 1808–1858 |
| Kapka Kassabova | author | 1973 |
| Lajos Kassák | Hungarian artist, poet, write… | 1887–1967 |
| Raheem Kassam | British journalist and politi… | 1986 |
| Suzy Kassem | American writer | 1975 |
| Roger Kastel | American artist | 1932 |
| Erich Kästner | German children's writer | 1899–1974 |
| Bernardo Kastrup | Dutch computer scientist and … | |
| Jyrki Katainen | Finnish politician | 1971 |
| Kyōichi Katayama | Japanese writer | 1959 |
| Mahmud Kati | Malian historian | 1468–1593 |
| Byron Katie | American spiritual writer | 1942 |
| Markandey Katju | Indian judge | 1946 |
| George Katona | American psychologist | 1901–1981 |
| Siddharth Katragadda | Indian writer | 1972 |
| Bob Katter | Australian politician | 1945 |
| Bernard Katz | | |
| Daniel Katz | American psychologist | 1903–1998 |
| Jonathan Katz | Comedian, actor | 1946 |
| John Wong Soo Kau | Malaysian Archbishop | 1968 |
| Irvin Kauffman | | |
| Louis Kauffman | American mathematician | 1945 |
| Stuart Kauffman | American biophysicist | 1939 |
| Andy Kaufman | American stand-up comedian an… | 1949–1984 |
| Beatrice Kaufman | American writer and playwright | 1895–1945 |
| Charlie Kaufman | American screenwriter | 1958 |
| Gerald Kaufman | British politician | 1930–2017 |
| Henry Kaufman | American economist | 1927 |
| Lloyd Kaufman | American film director | 1945 |
| Ron Kaufman | American author and consultant | 1956 |
| Christoph Kaufmann | | |
| Walter Kaufmann | American philosopher | 1921–1980 |
| Bel Kaufmanová | American novelist, teacher | 1911–2014 |
| Kenneth Kaunda | First President of Zambia | 1924 |
| Rupi Kaur | Canadian poet | 1992 |
| Aki Kaurismäki | Finnish film director | 1957 |
| Karl Kautsky | Czech-Austrian philosopher, j… | 1854–1938 |
| Eduard Kava | Ukrainian Roman Catholic Bish… | 1978 |
| Anna Kavan | British artist | 1901–1968 |
| Patrick Kavanagh | poet | 1904–1967 |
| Brett Kavanaugh | Associate Justice of the Supr… | 1965 |
| Julie Kavner | actress | 1950 |
| Yasunari Kawabata | Japanese author, Nobel Prize … | 1899–1972 |
| Yoshihiro Kawaoka | Japanese resercher | 1955 |
| On Kawara | artist | 1933–2014 |
