Encyclopedias, Almanacs, Transcripts, and Maps
- Caprimulgiformes (Nightjars)
- Captive Propagation and Reintroduction
- Capybaras (Hydrochaeridae)
- Carbon Emissions Trading
- Carbon Offsets (CO2-Emission Offsets)
- Carbon Tax
- Carcharhiniformes (Ground Sharks)
- Cards
- Caribbean Religions
- Caribbean Religions: Afro-Caribbean Religions
- Caribbean Religions: History of Study
- Caribbean Religions: Pre-Columbian Religions
- Carnivora (Land and Marine Carnivores)
- Carnot cycle
- Carolingian renaissance
- Carson, Rachel Louise (1907 – 1964) American Ecologist, Marine Biologist, and Writer
- Carter, Angela
- Carter, Jimmy (James Earl), Jr
- Cārvāka
- Cassowaries (Casuariidae)