Encyclopedias, Almanacs, Transcripts, and Maps
- California Society for Psychical Studies
- California Sun
- Callaway, Hugh G. (1885-1949)
- Callinicus of Heliopolis
- Callippus of Cyzicus
- Callipus
- Calmecacs
- Calmet, Dom Antoine Augustin (1672-1757)
- Calorie Restriction
- Calundronius
- Calvin Blackman Bridges
- Cambions
- Cambridge Buddhist Association
- Cambridge Diet
- Camels, Guanacos, Llamas, Alpacas, and Vicuñas: Camelidae
- Camera Obscura: Ancestor of Modern Photography
- Camille Guérin
- Camillo Golgi
- Camillus Leonardus
- Campagni, Roberto