Encyclopedias, Almanacs, Transcripts, and Maps
- Croker, Richard
- Cromarty
- Cromarty Firth
- Cromberger, Juan
- Crommelynck, Fernand
- Cronaca, Il
- Cronquist, Arthur C.
- Cronstedt, Axel Fredrik, Baron
- Crooked Island
- Crookes tube
- Cross, Wilbur Lucius
- cross-eye
- cross-fertilization
- Cross-Florida Waterway
- cross-laminated timber
- Crossfield, Scott
- Croton bug
- Crotona
- Crotone
- crude oil