Books about Extraterrestrial beings -- Fiction (sorted alphabetically)
- Peacemaker Alan Edward Nourse
- peuple du Pôle (French) Charles Derennes
- Pictures Don't Lie Katherine MacLean
- Planet of Creation Chester S. Geier
- Planet of the Gods Robert Moore Williams
- Prelude to Space Robert W. Haseltine
- Pure Observers B. J. Rogers
- Quest's End Basil Wells
- Rabbits Have Long Ears Lawrence F. Willard
- Rough Beast Roger D. Aycock
- Savage Galahad Bryce Walton
- Second Landing F. L. Wallace
- Seeder Max Williams
- Sentimentalists Murray Leinster
- Serpent River Don Wilcox
- Sex Life of the Gods M. E. Knerr
- Shock Troop Richard Bolton
- Short Snorter Charles Einstein
- silent invaders Robert Silverberg
- Smiler Albert Hernhuter
- Solar Stiff Chas. A. Stopher
- Special Delivery Kris Neville
- Specimen Charles V. De Vet
- Star-Crossed Lover William W. Stuart
- Star Mouse Fredric Brown