CA
- .ca
- Air China
- Bureau of Consular Affairs
- CA (journal)
- CA Technologies
- CA-class submarine
- Ca (Indic)
- Ca (Javanese)
- Ca (moth)
- Ca Mè Mallorquí
- Calcium
- California Angels
- Canadian Academy
- Canadian Alliance
- Cancer
- Candidatus
- Carbonic anhydrase
- Carcinoma
- Cardiac arrest
- Cary Academy
- Catalan Wikipedia
- Catalan language
- Catamarca Province
- Catecholamine
- Caterers' Association
- Cayman Airways
- Cellular automaton
- Cellulose acetate
- Centiampere
- Central America
- Centre Alliance
- Certificate Authority
- Certificate authority
- Channel America
- Character assassination
- Chartered Accountant
- Chemical Abstracts Service
- Chromatic aberration
- Circa (disambiguation)
- Citizens' Alliance
- City of Carlisle
- Civil affairs
- Claiborne Academy
- Clarksville Academy
- Class A (disambiguation)
- Club Africain
- Cocaine Anonymous
- Colorado Academy
- Combined authority
- Commission on Appointments
- Communication arts (disambiguation)
- Concord Academy
- Conditional access
- Confidentiality agreement
- Connections Academy
- Conservation agriculture
- Conservatives Abroad
- Continental Airlines
- Contrastive analysis
- Conversation Analysis
- Correspondence analysis
- Countryside Alliance
- Court of Appeals
- Creative Assembly
- Creativity (religion)
- Cricket Australia
- Cruising Association
- Crédit Agricole
- Cultural algorithm
- Culver Academies
- Current account (disambiguation)
- Customs Administration, Ministry of Finance
- Cyanoacrylate
- Cycling Australia
- Cả River
- French pronouns
- List of cruisers of the United States Navy
- Nissan CA engine
- Province of Cádiz
- Tokyo Bay Aqua-Line
- Tōkaidō Line
- Čadca District