Books in Science Fiction (sorted alphabetically)
- Revolution Mack Reynolds
- Revolutions of Time Jonathan Dunn
- Rex Ex Machina Frederic Max
- Right Time John Berryman
- Ring Once for Death Robert Arthur
- Ripeness is All Jesse Roarke
- Rip Foster in Ride the Gray Planet Harold L. Goodwin
- Rip Foster Rides the Gray Planet Harold L. Goodwin
- Risk Profession Donald E. Westlake
- Riya's Foundling Algis Budrys
- Rough Beast Roger D. Aycock
- Round-and-Round Trip H. B. Fyfe
- Runaway Joseph Samachson
- Runaway Asteroid Michael D. Cooper
- Runaway Skyscraper Murray Leinster
- R.U.R. (Czech) Karel Čapek
- Sabotage in Space Carey Rockwell
- Sales talk Con Blomberg
- Salvage in Space Jack Williamson
- Sand Doom Murray Leinster
- Saracen: Land of the Infidel Robert Shea
- Saracen: The Holy War Robert Shea
- Sargasso of Space Edmond Hamilton
- Satellite System H. B. Fyfe
- Satisfaction Guaranteed Joy Leache