CAA
- Atlantic Southeast Airlines
- California Alumni Association
- Campaign Against Antisemitism
- Canadian Archaeological Association
- Canadian Automobile Association
- Canadian Avalanche Association
- Canyon Athletic Association
- Carinthian Astronomical Association
- Carriage Association of America
- Case Alumni Association
- Cat Aficionado Association
- Center for Academic Advancement
- Center for American Archeology
- Center for Army Analysis
- Central African Airways
- Cerebral amyloid angiopathy
- Chester A. Arthur
- Children's Air Ambulance
- China Academy of Art
- China Advertising Association
- Citizenship (Amendment) Act, 2019
- Citizenship Amendment Act protests
- Civil Aeronautics Administration (Taiwan)
- Civil Aeronautics Administration (United States)
- Civil Aeronautics Administration (disambiguation)
- Civil Aviation Agency Slovenia
- Civil Aviation Authority (Moldova)
- Civil Aviation Authority (New Zealand)
- Civil Aviation Authority (South Africa)
- Civil Aviation Authority (United Kingdom)
- Civil Aviation Authority of Norway
- Civil Aviation Authority of the Philippines
- Civil aviation authority
- Clean Air Act (United States)
- Coastal Athletic Association
- Coastal Athletic Association Football Conference
- College Art Association
- Commission for Academic Accreditation
- Commonwealth Association of Architects
- Compagnie Africaine d'Aviation
- Computational aeroacoustics
- Computer Applications and Quantitative Methods in Archaeology
- Computer-aided assessment
- Computer-aided auscultation
- Concert Artistes Association
- Confederation of African Athletics
- Congressional Apportionment Amendment
- Copyright transfer agreement
- Council on African Affairs
- Coventry Arena railway station
- Cover Art Archive
- Creative Artists Agency
- Cuban Adjustment Act
- Cycle Action Auckland
- Cyprus Automobile Association
- DNS Certification Authority Authorization
- Insurance Australia Group
- Kalashnikov Concern
- Kalashnikov USA
- Latvian Civil Aviation Agency
- Methodist Commission on Aboriginal Affairs