Richard Searfoss
Richard Truly
Robert Cabana
Robert Crippen
Robert Curbeam
Robert Overmyer
Robert Parker
Robert Thirsk
Roberta Bondar
Roberto Vittori
Rodolfo Neri Vela
Roger Crouch
Ronald Evans
Ronald McNair
Ronald Sega
Russell Schweickart
Salizhan Sharipov
Sally Ride
Richard Truly
Robert Cabana
Robert Crippen
Robert Curbeam
Robert Overmyer
Robert Parker
Robert Thirsk
Roberta Bondar
Roberto Vittori
Rodolfo Neri Vela
Roger Crouch
Ronald Evans
Ronald McNair
Ronald Sega
Russell Schweickart
Salizhan Sharipov
Sally Ride
Sandra Magnus
Scott Altman
Scott Carpenter
Scott Parazynski
Sergei Avdeyev
Sergei Krikalev
Sergei Treschev
Sergei Zalyotin
Shannon Lucid
Sigmund Jähn
Soichi Noguchi
Stephanie Wilson
Stephen Frick
Stephen Robinson
Steven Hawley
Steven Lindsey
Story Musgrave
Stuart Roosa
Scott Altman
Scott Carpenter
Scott Parazynski
Sergei Avdeyev
Sergei Krikalev
Sergei Treschev
Sergei Zalyotin
Shannon Lucid
Sigmund Jähn
Soichi Noguchi
Stephanie Wilson
Stephen Frick
Stephen Robinson
Steven Hawley
Steven Lindsey
Story Musgrave
Stuart Roosa