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- George Pal (1908 - 80) When Worlds Collide
- David R. Palmer (born 1941)
- Ray Palmer (1910–1977)
- Edgar Pangborn (1909–1976)
- Alexei Panshin (born 1940)
- Cory Panshin, born (1947)
- James B.Patterson (born 1947)
- Stel Pavlou (born 1970)
- Donald G. Payne (born 1924)
- Hayford Peirce (born 1942)
- Charles Pellegrino (born 1953)
- Lawrence Person (born 1965)
- Steve Perry (born 1947)
- Emil Petaja (1915–2000)
- John T. Phillifent (1916–1976)
- Mark Phillips (joint pseudonym used by Lawrence Mark Janifer (1933–2002) and Randall Philip Garrett (1927–1987))
- Rog Phillips (1909–1965) (pseudonym of Roger P. Graham)
- Eden Phillpotts (1862–1960)
- John R. Pierce (1910–2002) (also known as J.J. Coupling)
- Marge Piercy (born 1936)
- H. Beam Piper (1904–1964)
- Doris Piserchia (born 1928)
- Brian Plante (born 1956)
- Charles Platt (born 1945)
- P. J. Plauger
- Van Allen Plexico (born 1968)
- Edgar Allan Poe (1809–1849)
- Frederik Pohl (born 1919)
- Arthur Porges (1915–2006)
- Jerry Pournelle (born 1933)
- Terry Pratchett (born 1948), Discworld series
- Robert Presslie (1920–2002)
- Paul Preuss (born 1942)
- Christopher Priest (born 1943)
- Philip Pullman (born 1946)
Read more about this topic: List Of Science Fiction Authors