Encyclopedias, Almanacs, Transcripts, and Maps
- Colombo, John Robert (1936-)
- Colonialism and Postcolonialism
- Colony and Colony Formation
- Colton, Ann Ree (1898-1984)
- Colubrids: Colubridae
- Colugo
- Colugos
- Colugos: Dermoptera
- Columbia Space Shuttle Disaster
- Columbus O'Donnell Iselin
- Colville, Wilbur Juvenal (ca. 1859-1917)
- Comb Jellies: Ctenophora
- Combinatorics in the Middle Ages
- Comet Hale-Bopp
- Comet Hale-Bopp
- Comité Illusionniste D'Expertise et D'Experimentation des Phenomenes Paranormaux (CIEEPP)
- Commercial Kits
- Commercialism in Scientific Research
- Committee for the Scientific Investigation of Claims of the Paranormal (CSICOP)
- Common Heritage of Mankind Principle