S
- Fred Saberhagen (1930–2007)
- Carl Sagan (1934–1996)
- Nick Sagan (born 1970)
- Don Sakers, (Dance for The Ivory Madonna)
- Margaret St. Clair (1911–1995) (also known as Idris Seabright)
- Emilio Salgari (1862–1911)
- Domingo Santos (born 1941) (pseudonym of Pedro Domingo Mutiñó)
- Pamela Sargent (born 1948)
- Al Sarrantonio (born 1952)
- Robert J. Sawyer (born 1960)
- John Scalzi (born 1969)
- Nat Schachner (1895–1955)
- Paul Scheerbart (1863–1915)
- James H. Schmitz (1911–1974)
- Stanley Schmidt (born 1944)
- Karl Schroeder (born 1962)
- J. Neil Schulman (born 1953)
- George H. Scithers (born 1929)
- Thomas N. Scortia (1926–1986)
- Arthur Sellings (1911–1968)
- Józef Sękowski (1800–1858)
- Rod Serling (1924–1975)
- Michael Shaara (1928–1988)
- Eric Shapiro (born 1978)
- William Shatner (born 1931)
- Richard S. Shaver (1907–1975)
- Bob Shaw (1931–1996)
- Nisi Shawl
- Robert Sheckley (1928–2005)
- Charles Sheffield (1935–2002)
- Mary Shelley (1797–1851)
- Lucius Shepard (born 1947)
- Joel Shepherd (born 1974)
- M. P. Shiel (1865–1947)
- T. L. Sherred (1915–1985)
- Lewis Shiner (born 1950)
- Sharon Shinn (born 1957)
- Wilmar H. Shiras (1908–1990)
- John Shirley (born 1953)
- Pavel Shumil (born 1957)
- William Shunn (born 1967)
- Luís Filipe Silva (born 1969)
- Robert Silverberg (born 1935)
- Clifford D. Simak (1904–1988)
- Dan Simmons (born 1948)
- Johanna Sinisalo (born 1958)
- Curt Siodmak (1902–2000)
- John Sladek (1937–2000)
- William Sleator (born 1945)
- Joan Slonczewski (born 1956)
- Clark Ashton Smith (1893–1961)
- Cordwainer Smith (1913–1966) (pseudonym of Paul M.A. Linebarger)
- E. E. Smith (1890–1965)
- Michael Marshall Smith (born 1965)
- George O. Smith (1911–1981)
- L. Neil Smith (born 1946)
- Melinda Snodgrass (born 1951)
- Jerry Sohl (1913–2002)
- Martha Soukup
- Steven Spielberg (born 1946) Close Encounters of the Third Kind
- Norman Spinrad (born 1940)
- Nancy Springer (born 1948)
- Margaret St. Clair (1911–1985)
- Dana Stabenow (born 1952)
- Brian Stableford (born 1948)
- Michael A. Stackpole (born 1957)
- Olaf Stapledon (1886–1950)
- Roman Frederick Starzl (1899–1976)
- Christopher Stasheff (born 1944)
- John Steakley (born 1951)
- Allen Steele (born 1958)
- Angela Steinmüller (born 1941)
- Karlheinz Steinmüller (born 1950)
- Neal Stephenson (born 1959)
- Jacques Sternberg (born 1923)
- Bruce Sterling (born 1954)
- Francis Stevens (1883–1948) (pseudonym of Gertrude Barrows Bennett)
- Marc Stiegler
- Ron Stillman (pseudonym of Don Bendell)
- G. Harry Stine (1928–1997) (also known as Lee Corey)
- S. M. Stirling (born 1953)
- John E. Stith (born 1947)
- J. Michael Straczynski (born 1954), Babylon 5
- Giampietro Stocco (born 1961)
- Charles Stross (born 1964)
- Arkady and Boris Strugatsky ((1925–1991) and (born 1933) respectively) (in Russian, Аркадий и Борис Стругацкие )
- Theodore Sturgeon (1918–1985) (pseudonym of Edward Hamilton Waldo)
- Somtow Sucharitkul (also known as S. P. Somtow)
- Richard J. Sutcliffe (born 1947)
- Michael Swanwick (born 1950)
- Jonathan Swift (1667–1745)
- Michael Szameit (born 1950)
Read more about this topic: List Of Science Fiction Authors