G
- Neil Gaiman (born 1960)
- Raymond Z. Gallun (1911–1994)
- Daniel F. Galouye (1920–1976)
- James Alan Gardner (born 1955)
- Martin Gardner (1914–2010)
- Richard Garfinkle (fl. 1990s)
- Randall Garrett (1927–1987)
- Mary Gentle (born 1956)
- Alistair Gentry
- Peter George (1924–1966)
- Hugo Gernsback (1884–1967) (namesake of the Hugo Award)
- David Gerrold (born 1944)
- Mark S. Geston (born 1946)
- Edward Gibson (born 1936)
- Gary Gibson
- William Gibson (born 1948)
- Alexis A. Gilliland (born 1931)
- Molly Gloss (born 1944)
- Tom Godwin (1915–1980)
- H. L. Gold (1914–1996)
- Lee Gold (born 1942)
- Lisa Goldstein (born 1953)
- Kathleen Ann Goonan (born 1952)
- Richard Gordon (born 1947)
- Phyllis Gotlieb (1926–2009)
- Ron Goulart (born 1933)
- Charles L. Grant (1942–2006)
- Roland J. Green (born 1944)
- Colin Greenland (born 1954)
- William Greenleaf (born 1948)
- Lois Gresh
- George Griffith (1857–1906)
- Nicola Griffith (born 1960)
- Jon Courtenay Grimwood
- Ken Grimwood (1944–2003)
- Alexander Gromov (in Russian Алексáндр Николáевич Грóмов)
- Martin Grzimek (born 1950)
- Wyman Guin (1915–1989)
- Eileen Gunn (born 1945)
- James E. Gunn (born 1923)
Read more about this topic: List Of Science Fiction Authors