Encyclopedias, Almanacs, Transcripts, and Maps
- Cassandre, Adolphe Mouron
- Cassandreia
- Cassegrain focus
- Cassel, Gustav
- Cassini's division
- Cassites
- Cassius Dio Cocceianus
- Castaldi, Pamfilo
- Castel Sant' Angelo
- Castelar y Ripoll, Emilio
- Castellani, Sir Aldo
- Castello, Bernardo
- Castello, Giovanni Battista
- Castello, Valerio
- Castellón de la Plana
- Castelnau, Michel de
- Castillo de San Marcos National Monument
- Castillon-la-Bataille
- Castle Clinton National Monument
- Castle Pinckney