CA
- ca – (s) Catalan language (ISO 639-1 code)
- Ca – (s) Calcium
- CA
- (s) California (postal symbol)
- Canada (FIPS 10-4 country code; ISO 3166 digram)
- Catalonia
- (i) Civil Affairs
- Close Armour
- Cocaine Anonymous
- Computer Associates
- Counter-Air
- Cricket Australia
- CAA
- (i) Canadian Automobile Association
- (NORAD) Center for Aerospace Analysis
- (U.S.) Center for Army Analysis
- (U.S.) Clean Air Act
- (U.S. Army) Concepts Analysis Agency
- Civil Aviation Authority
- Colonial Athletic Association
- CAAT
- (i) or (a) Campaign Against Arms Trade
- Center for Alternatives to Animal Testing
- CAC
- (i) California Association of Criminalists
- Chronic Asymptomatic Carrier
- CACM (i) Central American Common Market
- CACM – (i) Communications of the ACM
- CAD
- (s) Canadian dollar (ISO 4217 currency code)
- (a) Computer-Aided Design
- Computer-Aided Dispatch
- CADCAM – (a) Computer-Aided Design/Computer-Aided Manufacturing
- CADPAT – (p) CAnadian Disruptive PATtern
- CADMID – (a) Concept, Assessment, Demonstration, Manufacture, In service, Disposal (life cycle mnemonic)
- CAE
- (i) Canadian Aviation Electronics (originally)
- Certificate in Advanced English
- CAEn – (i/a) Close Action Engagement (constructive simulation)
- CAF
- (s) Central African Republic (ISO 3166 trigram)
- (i) Confederation of African Football (or French Confédération Africaine de Football)
- CAFAD – (a) Combined Arms For Air Defence
- CAFDE
- (a) Canadian Association of Film Distributors and Exporters
- Computer Aided Federation Development Environment
- CAFE – (a) Corporate Average Fuel Economy standard
- CAI – (i) Computer Assisted Instruction
- CAIR – (i) Council on American-Islamic Relations
- CALABARZON – (p) A region in the Philippines: CAvite, LAguna, BAtangas, Rizal, queZON
- CALL – (a) (U.S.) Center for Army Lessons Learned
- CALM – (p) Communications, Air-interface, Long and Medium range
- CalPERS – (p) California Public Employees' Retirement System
- Caltrans – (p) California Department of Transpotation
- CAM
- (a) Chemical Agent Monitor
- Complementary and alternative medicine
- Computer-Aided Manufacturing
- Crassulacean acid metabolism (type of photosynthesis)
- CAMRA – (p) CAMpaign for Real Ale
- CAN – (s) Canada (ISO 3166 trigram)
- CANA – (a) Convulsive Antidote, Nerve Agent
- CANDU – (p) CANada Deuterium Uranium (nuclear reactor design)
- Canola – (p) Canadian oil, low acid (referring to a specific cultivar of rapeseed bred to have a low erucic acid content)
- CAP
- (i) Combat Air Patrol
- Civil Air Patrol
- Common Air Picture
- Crisis Action Procedures
- Common Agricultural Policy (European Union)
- CAPES
- (p) CAPability Evaluation System
- (a) Combined Arms Planning and Execution System
- CARE
- (a) Citizens Association for Racial Equality (former New Zealand organisation)
- (p) Community database on Accidents on the Roads in Europe
- (a) Cooperative for Aid and Relief Everywhere (originally Cooperative for American Remittances to Europe)
- CARMONETTE – (p) Computerized Monte Carlo Simulation
- CARP – (a) Computed Air Release Point
- CART – (a) Championship Auto Racing Teams (now defunct)
- CAS
- (i) Chemical Abstracts Service
- Chief of the Air Staff
- Close Air Support
- CASE
- (a) Cellular ammunition storage equipment
- Computer-Aided Software Engineering
- CASS – (a) Command Activated Sonobuoy System
- CASTFOREM – (p) Combined Arms and Support Task FORce Evaluation Model
- CASTOR – (a) Canadian Automatic Small Telescopes for Orbital Research
- cat – (s) Catalan language (ISO 639-2 code)
- CAT
- (a) Community Acceptance Testing
- Computer-Assisted (or Axial) Tomography
- CATK – (p) Counterattack
- CATS – (a) Computer Active Technology Suspension
- CATT – (a/i) Combined Arms Tactical Trainer
- CAV – (p) Cavalry
- CAVOK – (p) Ceiling And Visibility OK ("Kav-okay")
- CAW – (i) Canadian Auto Workers (trade union)
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