C
- Pat Cadigan (born 1953)
- Jack Cady (1932–2004)
- Martin Caidin (1927–1997)
- John W. Campbell, Jr. (1910–1971) (also known as Don A. Stuart)
- Karel Čapek (1890–1938)
- Orson Scott Card (born 1951)
- Terry Carr (1937–1987)
- Lin Carter (1930–1988)
- Cleve Cartmill (1908–1964)
- Jeffrey Carver (born 1949)
- Gianluca Casseri (died 2011)
- Jay Caselberg
- Jack L. Chalker (1944–2005)
- A. Bertram Chandler (1912–1984)
- Suzy McKee Charnas (born 1939)
- Daína Chaviano (born 1960)
- Richard Chwedyk (born 1955)
- C. J. Cherryh (born 1942)
- Ted Chiang (born 1967)
- Charles Chilton (born 1917)
- John Christopher (1922–2012) (pseudonym of Samuel Youd)
- Massimo Citi (born 1955)
- Charles Heber Clark (1841–1915) (also known as Max Adeler and John Quill)
- Arthur C. Clarke (1917–2008)
- Jo Clayton (1939–1998)
- Hal Clement (1922–2003) (pseudonym of Harry Clement Stubbs)
- John Cleve (pseudonym of Andrew J. Offutt)
- Mark Clifton (1906–1963)
- Brenda Clough (born 1955)
- John Clute (born 1940)
- Stephen Euin Cobb (born 1955)
- Stanton A. Coblentz (1896–1982)
- Theodore Cogswell (1918–1987)
- Frona Eunice Wait Colburn (1859–1946)
- Erroll Collins (1906–1991) (pseudonym of Ellen Edith Hannah Redknap)
- Suzanne Collins (1962)
- David G. Compton (born 1930)
- Michael Coney (1932–2005)
- Groff Conklin (1904–1968)
- Storm Constantine (born 1956)
- Glen Cook (born 1944)
- Hugh Cook (1956–2008)
- Paul Cook (born 1950)
- Edmund Cooper (1926–1982)
- Alfred Coppel (1921–2004)
- Richard Cowper (1926–2002) (pseudonym John Middleton Murry, Jr. used when writing science fiction)
- Erle Cox (1873–1950)
- John G. Cramer (born 1934)
- Michael Crichton (1942–2008)
- Compton N. Crook (1908–1981) (also known as Stephen Tall)
- John Crowley (born 1942)
- Andrew Crumey (born 1961)
- Ray Cummings (1887–1957)
- Julie E. Czerneda (born 1955)
Read more about this topic: List Of Science Fiction Authors