Palmer, Ray, --The Hell Ship, #1, March, 1952. (novelette)
Panshin, Alexei, --Down to the Worlds of Men, July, 1963. (novelette)
Pease, M. C., --Generals Help Themselves, November, 1952.
Peck, Richard E., --The Guardians, #150, September-October, 1970. --A Slight Detour, #152, January-February, 1971.
Perri, Leslie, --In the Forrest, September, 1953.
Phillips, Rog, (Roger Phillips Graham) --The Old Martians, #1, March, 1952. --Ye of Little Faith, January, 1953. (short novel) --Game Preserve, October, 1957.
Piserchia, Doris, --Last Train from Earth, #161, July-August, 1972. --Empty Eden, #163, November-December, 1972.
Plachta, Dannie, --Alien Artifact, September, 1965. --The Man from When, #104, July, 1966.
Pohl, Frederik, --The Martian in the Attic, July, 1960. * --Father of the Stars, November, 1964. * --Under Two Moons, September, 1965. (novelette) --The Merchants of Venus, #161, July-August, 1972. (novella) --also see Williamson, Jack, and Frederik Pohl
Porges, Arthur, --Words and Music, September, 1960.
Proulx, E. A., --The Customs Lounge, September, 1963.