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- Radiant by James Alan Gardner
- Radix Tetrad series by A. A. Attanasio
- namely, Radix, In Other Worlds, Arc of the Dream, and The Last Legends of Earth
- Raising the Stones by Sheri S. Tepper
- Rappaccini's Daughter by Nathaniel Hawthorne
- The Realms of Tartarus by Brian Stableford
- Flight from Rebirth by J. T. McIntosh
- Red by Ted Dekker
- Red Mars by Kim Stanley Robinson
- also Green Mars, and Blue Mars
- Redemption Ark by Alastair Reynolds
- Report on Probability A by Brian W. Aldiss
- Revelation Space by Alastair Reynolds
- Revolt on Alpha C by Robert Silverberg
- Ringworld by Larry Niven
- also The Ringworld Engineers, The Ringworld Throne, Ringworld's Children
- Rendezvous with Rama by Arthur C. Clarke
- Renegade of Callisto by Lin Carter
- Rite of Passage by Alexei Panshin
- Roadmarks by Roger Zelazny
- Roadside Picnic by Arkady and Boris Strugatsky
- Robots of Dawn by Isaac Asimov
- Rocannon's World by Ursula K. Le Guin
- Roderick and Roderick at Random by John Sladek
- R.U.R. (Rossum's Universal Robots) by Karel Čapek
- Rumors of Spring by Richard Grant
- Rynosseros by Terry Dowling
Read more about this topic: List Of Science Fiction Novels