| Aaron Klug | British chemist and biophysic… | 1926–2018 |
| Brian Klug | British philosopher | |
| Günther von Kluge | German general | 1882–1944 |
| Hans Kluge | Belgian doctor, senior offici… | 1968 |
| Steve Kluger | American writer | 1952 |
| James Klugmann | British writer | 1912–1977 |
| Heidi Klum | German model, television host… | 1973 |
| Kate Klunk | American politician | 1982 |
| Martin Kmetec | Slovenian Catholic archbishop | 1956 |
| Caroline Knapp | American writer | 1959–2002 |
| Karl Ove Knausgård | Norwegian author | 1968 |
| Fletcher Knebel | Novelist, journalist | 1911–1993 |
| Godfrey Kneller | painter from Germany active i… | 1646–1723 |
| Adolph Freiherr Knigge | German writer and Freemason | 1752–1796 |
| Bobby Knight | American college basketball c… | 1940–2023 |
| Damon Knight | American science fiction writ… | 1922–2002 |
| Frank Knight | American economist | 1885–1972 |
| Holly Knight | American singer-songwriter an… | |
| Keira Knightley | British actress | 1985 |
| Mark Knopfler | English guitarist | 1949 |
| Yuri Knorozov | Soviet and Russian mesoameric… | 1922–1999 |
| Cargill Gilston Knott | British mathematician and phy… | 1856–1922 |
| J. Proctor Knott | American politician | 1830–1911 |
| John Knowles | American novelist | 1926–2001 |
| Stanley Knowles | Canadian politician | 1908–1997 |
| Nancy Knowlton | American biologist | 1949 |
| Elizabeth Knox | New Zealand writer | 1959 |
| Elyse Knox | American actress | 1917–2012 |
| Henry Knox | Continental Army and US Army … | 1750–1806 |
| John Knox | Scottish clergyman, writer an… | 1514–1572 |
| Ronald Knox | English priest and theologian | 1888–1957 |
| William Knox | | |
| Donald Ervin Knuth | American computer scientist | 1938 |
| Kris Kobach | American politician | 1966 |
| Charles G. Koch | American businessman | 1935 |
| David Koch | | |
| Ed Koch | former mayor of New York City | 1924–2013 |
| Howard Koch | American screenwriter | 1901–1995 |
| Richard Koch | German medical historian and … | 1950 |
| Thomas A. Kochan | American academic | 1947 |
| Robert Kocharyan | second President of Armenia | 1954 |
| Yuri Kochiyama | American activist | 1921–2014 |
| Ibrahim Kodra | father of Albanian contempora… | 1918–2006 |
| Kalki Koechlin | Indian actress | 1984 |
| Barend Cornelis Koekkoek | painter from the Northern Net… | 1803–1862 |
| Ezra Koenig | American rock musician | 1984 |
| Helmut Koester | biblical scholar | 1926–2016 |
| Arthur Koestler | Hungarian-British author and … | 1905–1983 |
| Kurt Koffka | German psychologist | 1886–1941 |
| Sarah Kofman | philosopher from France | 1934–1994 |
| Alireza Kohany | Musician, Actor, Entrepreneur | 1993 |
| Helmut Kohl | former chancellor of West Ger… | 1930–2017 |
| Hermann Friedrich Kohlbrügge | Dutch minister | 1803–1874 |
| Horst Köhler | German politician (CDU); pres… | 1943 |
| Wolfgang Köhler | German-American psychologist … | 1887–1967 |
| Virat Kohli | Indian cricket player | 1988 |
| Alfie Kohn | American author and lecturer | 1957 |
| Hans Kohn | American historian | 1891–1971 |
| Walter Kohn | American physicist | 1923–2016 |
| Manisha Koirala | Nepalese actress, UNFPA Goodw… | 1970 |
| Mauno Koivisto | President of Finland | 1923–2017 |
| Alexandre Kojève | Russian-born French philosoph… | 1902–1968 |
| Hideo Kojima | Japanese video game designer | 1963 |
| Ingrid de Kok | South African writer | 1951 |
| Teresa Kok | Malaysian politician | 1964 |
| Wim Kok | | |
| Oskar Kokoschka | Austrian dramatic, painter an… | 1886–1980 |
| Leszek Kolakowski | Philosopher, historian of ide… | 1927–2009 |
| David A. Kolb | American psychologist | 1939 |
| Maximilian Kolbe | Polish Conventual Franciscan … | 1894–1941 |
| Elizabeth Kolbert | journalist and author | 1961 |
| Charles Allen Kollar | | |
| Juna Kollmeier | American astrophysicist | |
| Alexandra Kollontai | Soviet diplomat | 1872–1952 |
| Käthe Kollwitz | German artist | 1867–1945 |
| Theodoros Kolokotronis | Greek general | 1770–1843 |
| Ono no Komachi | Japanese poet | 825–900 |
| Bronisław Komorowski | Polish politician, president … | 1952 |
| Yusef Komunyakaa | American writer | 1947 |
| Marie Kondo | Japanese organizing consultan… | 1984 |
| Ivan Konev | Soviet military commander | 1897–1973 |
| E. L. Konigsburg | American writer and illustrat… | 1930–2013 |
| Takeshi Konomi | Japanese manga artist | 1970 |
| Matsushita Konosuke | Japanese businessman | 1894–1989 |
| Ventseslav Konstantinov | Bulgarian writer and Translat… | 1940–2019 |
| Alethea Kontis | American writer | 1976 |
| Joel Matthias Konzen | Roman Catholic bishop | 1950 |
| Abraham Isaac Kook | first Ashkenazi chief rabbi o… | 1865–1935 |
| Rem Koolhaas | Dutch architect (b.1944) | 1944 |
| Dorothy Koomson | British writer | 1971 |
| Elaine de Kooning | American painter | 1918–1989 |
| Willem de Kooning | Dutch painter | 1904–1997 |
| Jeff Koons | American artist | 1955 |
| Dean Koontz | American author | 1945 |
| Harold Koontz | | 1909–1984 |
| C. Everett Koop | American pediatric surgeon an… | 1916–2013 |
| Marion Koopmans | Dutch university teacher | 1956 |
| Tjalling Koopmans | Dutch American economist | 1910–1985 |
| Ted Kooser | American poet | 1939 |
| Nancy Kopell | American mathematician | 1942 |
