| Marcus Tullius Cicero | Roman philosopher and statesm… | -106–-43 BC |
| Noah Cicero | American writer | 1980 |
| El Cid | Spanish nobleman and military… | 1048–1099 |
| Mike Cierpiot | American politician | 1953 |
| Paul Cilliers | South African philosopher | 1956–2011 |
| Jill Ciment | Canadian writer | 1955 |
| Emil M. Cioran | Romanian philosopher and essa… | 1911–1995 |
| Carson Cistulli | American poet and writer | 1979 |
| Zeno of Citium | ancient Greek philosopher | -334–-263 BC |
| Nicolae Ciucă | Romanian politician and milit… | 1967 |
| Chiara Civello | Italian singer | 1975 |
| Empress Dowager Cixi | Chinese empress | 1835–1908 |
| Liu Cixin | Chinese science fiction writer | 1963 |
| Hélène Cixous | French philosopher and writer | 1937 |
| Louis C.K. | American comedian and actor | 1967 |
| Craig Claiborne | Journalist and book author | 1920–2000 |
| Shane Claiborne | American activist | 1975 |
| Jeffrey St. Clair | American journalist | 1959 |
| William St Clair | author | 1937 |
| Bernard of Clairvaux | French abbot, theologian | 1090–1153 |
| Tom Clancy | American author | 1947–2013 |
| Helen Blackwood, Baroness Dufferin and Claneboye | British songwriter, composer,… | 1807–1867 |
| James Clapper | US government official | 1941 |
| Eric Clapton | English musician, singer, son… | 1945 |
| Cassandra Clare | American author | 1973 |
| John Clare | English poet | 1793–1864 |
| Pamela Clare | | |
| Edward Hyde, 1st Earl of Clarendon | English politician | 1609–1674 |
| Alan Clark | British politician | 1928–1999 |
| Andy Clark | philosopoher | 1957 |
| Anne Clark | | |
| Carol Higgins Clark | Novelist | 1956 |
| Catherine Clark | Canadian journalist | 1976 |
| Cyril Drummond Le Gros Clark | Secretary of Sarawak | 1894–1945 |
| Dane Clark | American film actor | 1912–1998 |
| David Clark | American computer scientist | 1944 |
| Dick Clark | American radio personality | 1929–2012 |
| George Rogers Clark | American general | 1752–1818 |
| Gordon H. Clark | American philosopher and Calv… | 1902–1985 |
| Helen Clark | 37th Prime Minister of New Ze… | 1950 |
| Jim Clark | British racecar driver | 1936–1968 |
| Joe Clark | 16th Prime Minister of Canada | 1939 |
| J. Reuben Clark | Member of the Quorum of the T… | 1871–1961 |
| Kenneth Clark | Art historian, broadcaster an… | 1903–1983 |
| Mark W. Clark | American general | 1896–1984 |
| Mary Higgins Clark | Novelist, writer | 1927–2020 |
| Petula Clark | British actress and singer | 1932 |
| Ramsey Clark | United States Marine | 1927 |
| Stephen R. L. Clark | British philosopher | 1945 |
| Thomas March Clark | American bishop | 1812–1903 |
| Wahida Clark | American writer | |
| Wesley Clark | American general and former D… | 1944 |
| Arthur C. Clarke | British science fiction write… | 1917–2008 |
| Bobby Clarke | Canadian ice hockey player | 1949 |
| Charles Clarke | British Labour Party politici… | 1950 |
| George Elliott Clarke | Canadian writer | 1960 |
| Gillian Clarke | Welsh poet | 1937 |
| Henry Savile Clarke | | 1841–1893 |
| James Freeman Clarke | American theologian and writer | 1810–1888 |
| John Cooper Clarke | English performance poet | 1951 |
| John Henrik Clarke | American historian and writer | 1915–1998 |
| Ken Clarke | British Conservative politici… | 1940 |
| Kristen Clarke | American lawyer | |
| McDonald Clarke | American writer | 1798–1842 |
| Stephen Clarke | British author | 1958 |
| Susanna Clarke | British author | 1959 |
| Jeremy Clarkson | English broadcaster, journali… | 1960 |
| Kelly Clarkson | American singer-songwriter, a… | 1982 |
| Laurence Clarkson | English theologian | 1615–1667 |
| Thomas Clarkson | English abolitionist | 1760–1846 |
| Mick Jones (The Clash) | British rock guitarist (The C… | 1955 |
| George S. Clason | British businessman and writer | 1874–1957 |
| Carl Clauberg | German general | 1898–1957 |
| Camille Claudel | French sculptor and graphic a… | 1864–1943 |
| Paul Claudel | French diplomat | 1868–1955 |
| Claudian | Roman Latin poet | 370–404 |
| Matthias Claudius | German poet | 1740–1815 |
| Hugo Claus | Belgian author | 1929–2008 |
| Carl von Clausewitz | German-Prussian soldier and m… | 1780–1831 |
| Rudolf Clausius | German mathematical physicist | 1822–1888 |
| James Clavell | American novelist | 1921–1994 |
| Andrew Dice Clay | American comedian and actor | 1957 |
| Henry Clay | American politician from Kent… | 1777–1852 |
| Pearl Cleage | American novelist | 1948 |
| James Clear | American author and speaker | 1986 |
| Beverly Cleary | American writer of children's… | 1916 |
| Brian P. Cleary | American writer | 1959 |
| Eldridge Cleaver | American activist | 1935–1998 |
| John Cleese | actor from England | 1939 |
| Nick Clegg | British politician | 1967 |
| John Cleland | British writer | 1709–1789 |
| Max Cleland | American politician | 1942 |
| Georges Clemenceau | French politician | 1841–1929 |
| Joceline Clemencia | Curaçaoan writer | 1952–2011 |
| Hal Clement | American author | 1922–2003 |
| David Clement-Davies | British writer | 1964 |
| Roberto Clemente | Puerto Rican baseball player | 1934–1972 |
| Andrew Clements | American writer | 1949–2019 |
| Laurent Clerc | French-American deaf educator | 1785–1869 |
| Agnes Mary Clerke | British astronomer | 1842–1907 |
