CA or ca may refer to:
Businesses and organizations
Companies
- Air China (IATA airline code CA)
 - CA Technologies, a U.S. software company
 - Cayman Airways, a Cayman Islands airline
 - Channel America, a defunct U.S. television network
 - Classic Army, a Hong Kong-based manufacturer of airsoft replicas
 - Coal & Allied, Australian mining company
 - Continental Airlines, a U.S. airline
 - Creative Assembly, a PC game developer
 - Crédit Agricole, a major French bank
 
Government and political
- Bureau of Consular Affairs, a division of the U.S. Department of State
 - Canadian Alliance, a former Canadian political party
 - Centre Alliance, Australian political party formerly known as Nick Xenophon Team
 - Citizens' Alliance, a political party in Trinidad and Tobago
 - Combined authority, a local government entity in the United Kingdom
 - Commission on Appointments, a body of the Congress of the Philippines
 - Conservatives Abroad, overseas wing of the British Conservative Party
 - Countryside Alliance, a British political organization
 - Court of Appeals
 - Customs Administration, an agency of Taiwan
 
Schools
- Canadian Academy, an international school in Kobe, Japan
 - Cary Academy, a private college-preparatory school in Cary, North Carolina, United States
 - Claiborne Academy, a private school in Claiborne Parish, Louisiana, United States
 - Clarksville Academy, a private college-preparatory school in Clarksville, Tennessee, United States
 - Colorado Academy, a private college-preparatory school in Lakewood, Colorado, United States
 - Concord Academy, a private college-preparatory school in Concord, Massachusetts, United States
 - Connections Academy, an online school based in Baltimore, Maryland, United States
 - Culver Academies, a boarding school and summer camp program in Culver, Indiana, United States
 
In sport
- California Angels, former name of a professional baseball team currently known as Los Angeles Angels
 - Club Africain, a multi-sport club from Tunis, Tunisia
 - Cricket Australia, the governing body for professional and amateur cricket in Australia
 - Cruising Association, a UK membership organization for sailors
 - Cycling Australia, the national governing body for bicycle racing in Australia
 
Other organizations
- Caterers' Association, former UK trade association
 - Cocaine Anonymous, a twelve-step program
 - Creativity Alliance, an arm of Creativity (religion), a white supremacist organization
 
In linguistics
- ca., abbreviation for circa (latin), meaning approximately
 - Ça, French demonstrative pronoun
 - Ca (Indic), a glyph in the Brahmic family of scripts
 - Ca (Javanese), a letter in the Javanese script
 - Catalan language (ISO 639 alpha-2 language code)
 - ca, the subdomain for Catalan Wikipedia
 - Contrastive analysis, the systematic study of a pair of languages
 
Mathematics, science, and technology
Biology and medicine
- CA (journal), a medical journal
 - Ca (moth), a moth genus
 - Ca., abbreviation for Candidatus, for taxonomical names that have not been completely described
 - Cancer
 - Carbonic anhydrase, a family of enzymes
 - Carcinoma, a type of cancer
 - Cardiac arrest
 
Chemistry
- Calcium, symbol Ca, a chemical element
 - Catecholamine, an organic compound
 - Cellulose acetate, a type of plastic
 - Chemical Abstracts, a publication of Chemical Abstracts Service
 - Cyanoacrylate, a chemical compound
 
Mathematics and computing
- Cellular automaton, a discrete mathematical model
 - Certificate authority, an entity issuing digital certificates for secure communications
 - Correspondence analysis, a multivariate statistical technique
 - Cultural algorithm, a type of evolutionary computation in computer science
 
Other uses in science and technology
- Centiampere (cA), an SI unit of electric current
 - Certificate Authority (CA), an entity that issues digital certificates
 - CA-class submarine, a World War II Italian midget submarine
 - Nissan CA engine, used in smaller Nissan vehicles
 - Chromatic aberration, a distortion in optical lenses
 - Conditional access, in broadcast engineering
 - Conservation agriculture, a food system
 - Conversation Analysis, the study of talk in interaction
 
Places
- Cả River, in Laos and Vietnam
 - Province of Cádiz, Spain
 - California, US state by postal abbreviation
 - Canada, by ISO 3166-1 alpha-2 code
- .ca, Internet country code for Canada
 
 - City of Carlisle, United Kingdom, by postcode
 - Catamarca Province, Argentina
 - Central America
 - Tokyo Bay Aqua-Line, a bridge-tunnel across Tokyo Bay area in Japan, numbered as CA
 
Other uses
- CA-, a road designation for highways part of the Central American highway network
 - CA, the official designation for heavy cruiser in the U.S. Navy from 1920–1945
 - 'CA': Tactical Naval Warfare in the Pacific 1941-43, a 1973 board wargame that simulates World War II naval combat
 - Ca Mè Mallorquí, a dog breed native to Spain
 - centiare = 1 square metre
 - Chartered Accountant
 - Civil affairs, a term used by both the United Nations and by military institutions
 - Communication arts (disambiguation)
 - Confidentiality agreement
 - Current account (disambiguation), in economics
 - A US Navy hull classification symbol: Heavy cruiser (CA)
 
See also
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