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- John Taine (1883–1960) (pseudonym of Eric Temple Bell)
- Stephen Tall (1908–1981) (pseudonym of Compton N. Crook)
- Yoshiki Tanaka, Legend of the Galactic Heroes
- Charles R. Tanner (1896–1974)
- Howard Tayler, webcomic Schlock Mercenary
- Mark Anthony Taylor (born 1970)
- Dr. Travis S. Taylor (born 1968)
- Steve Rasnic Tem (born 1950)
- William F. Temple (1914–1989)
- Tais Teng (born 1952) (nom de plume of Thijs van Ebbenhorst Tengbergen)
- William Tenn (1920–2010) (pseudonym of Philip Klass)
- Sheri S. Tepper (born 1929)
- Tom Terry (born 1963)
- Walter Tevis (1928–1984)
- Robert Thurston
- Mark W. Tiedemann (born 1954)
- Patrick Tilley (born 1928)
- James M. Tiptree, Jr (1915–1987) (pseudonym of Alice Sheldon)
- Aleksei Nikolaevich Tolstoi (born 1882 or 1883, died 1945) (in Russian Алексей Николаевич Толстой)
- Karen Traviss
- E. C. Tubb (1919–2010)
- George Tucker (1775–1861)
- Wilson Tucker (1914–2006)
- George Turner (1916–1997)
- Harry Turtledove (born 1949)
- Mary Turzillo
- John Twelve Hawks
- Kathy Tyers (born 1952)
Read more about this topic: List Of Science Fiction Authors