Astronauts 12 / 15
S. David Griggs (1939)
Salizhan Sharipov (1964)
Samantha Cristoforetti (1977)
Samuel T. Durrance (1943)
Sandra Magnus (1964)
Satoshi Furukawa (1964)
Scott Altman (1959)
Scott Carpenter (1925)
Scott D. Tingle (1965)
Scott E. Parazynski (1961)
Scott J. Horowitz (1957)
Scott Kelly (1964)
Serena M. Auñón (1976)
Sergei Avdeyev (1956)
Sergei Krikalev (1958)
Sergei Revin (1966)
Sergei Treshchov (1958)
Sergei Zalyotin (1962)
Sergey Alexandrovich Volkov (1973)
Sergey Ryazansky (1974)
Shannon Lucid (1943)
Shannon Walker (1965)
Sheikh Muszaphar Shukor (1972)
Sherwood C. Spring (1944)
Sidney M. Gutierrez (1951)
Sigmund Jähn (1937)
Soichi Noguchi (1965)
Sonny Carter (1947)
Stanley G. Love (1965)
Stephanie Wilson (1966)
Stephen Bowen (1964)
Stephen Frick (1964)
Stephen Robinson (1955)
Stephen S. Oswald (1951)
Stephen Thorne (1953)
Steven Hawley (1951)
Steven Lindsey (1960)
Steven R. Nagel (1946)
Steven Smith (1958)
Steven Swanson (1960)