Authors Born on January 1
- Camara Laye Writer, 1928
- Candice Millard Historian, 1968
- Capers Jones Engineer, 1938
- Caragh M. O'Brien Author, 2000
- Carl B. Hamilton Economist, 1946
- Carlo Ratti Architect, 1971
- Carlos Beruff Businessman, 1958
- Carole Landis Actress, 1919
- Carolyn Coman Writer, 1951
- Casey Barnes Singer-Songwriter, 1978
- Cassandra Danz Actress, 1947
- Catherine Drinker Bowen Writer, 1897
- Catherine Gilbert Murdock Writer, 2000
- Catherine Sanderson Blogger, 2000
- Chai Jing Journalist, 1976
- Chandra Talpade Mohanty Professor, 1955
- Charles "C.C." Chapman Author, 1973
- Charles Bowen Judge, 1835
- Charles Doran Actor, 1877
- Charles Edward Montague Journalist, 1867
- Charles Harper Webb Poet, 1900
- Charles le Gai Eaton Diplomat, 1921
- Charles Seife Author, 1953
- Charles Seymour Historian, 1885
- Charlie Munger Investor, 1924
- Chiune Sugihara Diplomat, 1900
- Christi Paul Journalist, 1969
- Christie Craig Author, 2000
- Christine Feehan Writer, 2000
- Christine Lagarde Lawyer, 1956
- Christopher McQuarrie Screenwriter, 1968
- Christopher Moore Writer, 1957
- Claron McFadden Singer, 1961
- Claudia Rankine Poet, 1963
- Colin Morgan Actor, 1986
- Country Joe McDonald Singer-Songwriter, 1942
- Dalia Mogahed Activist, 1974
- Damian Pettigrew Film Maker, 1953
- Damian Woetzel Dancer, 1967
- Dan Chaon Author, 1964