CA most often refers to: * Canada, a country by ISO 3166-1 alpha-2 code * California, U.S. state by postal abbreviation CA or ca may also 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 * 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, Ministry of Finance, 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., an abbreviation for ''wiktionary:circa, circa'', meaning "approximately" in Latin * ''Ça'', French pronouns#Demonstrative pronouns, 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), ''CA'' (journal), a medical journal * Ca (moth), ''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, ''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 * 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, Internet country code for Canada * 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 * Character assassination, a deliberate and sustained effort to damage the reputation or credibility of an individual * Chartered Accountant * Civil affairs, a term used by both the United Nations and by military institutions * Communication arts (disambiguation) * Confidentiality agreement * , a type of corporate organization in Venezuela * Current account (disambiguation), in economics * A US Navy hull classification symbol: List of cruisers of the United States Navy#Heavy and light cruisers (CA, CL), Heavy cruiser (CA) * CA, symbol for JR Tōkaidō Line from Atami Station, Atami to Maibara Station, Maibara, operated by JR Central