Encyclopedias, Almanacs, Transcripts, and Maps
- Constantinus Africanus
- Constantius II
- Constantius III
- Constitution Gardens
- Constitution Island
- Constitution of Athens
- Consumer Financial Protection Bureau
- Consumers' Union
- contact process
- continuation school
- continuing education
- contract bridge
- control surface
- Contucci, Andrea
- convector
- Convention on International Trade in Endangered Species of Wild Fauna and Flora
- convertiplane
- convolvulus
- Conway of Allington, William Martin Conway, 1st Baron
- Conway, Henry Seymour