Books in Science Fiction (sorted alphabetically)
- Craphound Cory Doctorow
- Creature from Cleveland Depths Fritz Leiber
- Creatures of the Abyss Murray Leinster
- Creatures of Vibration Harl Vincent
- Criminal Negligence J. Francis McComas
- Crossroads of Destiny H. Beam Piper
- Cry from a Far Planet Tom Godwin
- Cry Snooker Andrew Fetler
- Crystal Crypt Philip K. Dick
- Cubs of the Wolf Raymond F. Jones
- Cuckoo Clock Wesley Barefoot
- Cully Jack Egan
- Cum Grano Salis Randall Garrett
- Curiosities of the Sky Garrett Putman Serviss
- D-99: a science-fiction novel H. B. Fyfe
- Damned If You Don't Randall Garrett
- Danger in Deep Space Carey Rockwell
- Dark Door Alan Edward Nourse
- Dark Other Stanley G. Weinbaum
- Dave Dashaway and His Hydroplane; Or, Daring Adventures over the Great Lake Roy Rockwood
- Dawningsburgh Wallace West
- Day of the Boomer Dukes Frederik Pohl
- Day of the Moron H. Beam Piper
- Day Time Stopped Moving Ed Earl Repp
- Dead End Wallace Macfarlane