Other
- The law of Comparative Advantage
- Catalan language, ISO 639 alpha-2 language code (ca)
- Central Administration
- Certified archivist, a type of archivist in the United States
- Chartered accountant (CA)
- Chief of Army (Australia)
- Christian anarchism, or an adherent of Christian anarchism
- Civil Affairs, the official name for military units that conduct civil-military operations
- Class A (disambiguation)
- Combat Arms, a popular first-person shooter
- Confidentiality Agreement
- Copa América‚ an association football tournament
- CA are the first two letters on the license plates of vehicles registered in the City of Cape Town
- CA, Casio's mobile phones in Japan
- CA, abbreviation for Chief Adjudicator in debating.
Read more about this topic: CA