R
- Ayn Rand (1905–1982)
- Bill Ransom ISFDB
- Satyajit Ray (1921–1992)
- Tom Reamy (1935–1977)
- Melanie Rawn
- Robert Reed (born 1956)
- Miha Remec (born 1928)
- Laura Resnick (born 1962)
- Mike Resnick (born 1942)
- Alastair Reynolds (born 1966)
- Mack Reynolds (1917–1983)
- Christopher Rice
- John Ringo, Empire of Man series with David Weber
- Adam Roberts (born 1965)
- Keith Roberts (1935–2000)
- Shauna S. Roberts (born 1956)
- Sujatha Rangarajan (1935–2008)
- Frank M. Robinson (born 1926)
- Jeanne Robinson (1948–2010)
- Kim Stanley Robinson (born 1952)
- Spider Robinson (born 1948)
- Justina Robson (born 1968)
- Esther Rochon(born 1948)
- Ross Rocklynne (1913–1988)
- Gene Roddenberry (1921–1991), Star Trek
- Carlos Rasch (born 1932)
- Simon Rose
- Joel Rosenberg (born 1954), Guardians of the Flame
- J.-H. Rosny (joint pseudonym of Joseph (1856–1940) and Séraphin (1859–1948) Boex)
- Milton A. Rothman (1919–2001)
- Tony Rothman (born 1953)
- William Rotsler (1926–1997)
- Christopher Rowley (born 1948)
- Rudy Rucker (born 1946)
- Kristine Kathryn Rusch (born 1960)
- Joanna Russ (born 1937)
- Richard Paul Russo (born 1954)
- Eric Frank Russell (1905–1978)
- Mary Doria Russell (born 1950)
- Geoff Ryman (born 1951)
Read more about this topic: List Of Science Fiction Authors