CA or ca may refer to:

Businesses and organizations

Companies

* Air China (IATA airline code CA) *

CA Technologies CA Technologies, formerly known as CA, Inc. and Computer Associates International, Inc., is an American multinational corporation headquartered in New York City. It is primarily known for its business-to-business (B2B) software with a product po ...

, a U.S. software company *

Cayman Airways Cayman Airways is the flag carrier airline of the British Overseas Territory of the Cayman Islands. With its head office in Grand Cayman, it operates mainly as an international and domestic scheduled passenger carrier, with cargo services avai ...

, a Cayman Islands airline *

Channel America Channel America (CA), officially Channel America Network, Inc., was the first United States terrestrial broadcast television network to be intentionally assembled out of LPTV, or low-power television licensees. The network was founded by David Po ...

, a defunct U.S. television network * Classic Army, a Hong Kong-based manufacturer of airsoft replicas *

Coal & Allied Coal & Allied is an Australia coal mining company. Operating mines in the Hunter Region, it is a subsidiary of Yancoal. History Coal & Allied was formed in 1960 when Caledonian Collieries and J & A Brown & Abermain-Seaham Collieries merged. H ...

, Australian mining company * Continental Airlines, a U.S. airline *

Creative Assembly The Creative Assembly Limited (trade name: Creative Assembly) is a British video game developer based in Horsham, founded in 1987 by Tim Ansell. In its early years, the company worked on porting games to MS-DOS from Amiga and ZX Spectrum platfor ...

, a PC game developer * Crédit Agricole, a major French bank

Government and political

Bureau of Consular Affairs The Bureau of Consular Affairs (CA) is a bureau of the United States Department of State reporting to the under secretary of state for management. The mission of the Bureau is to administer laws, formulate regulations and implement policies re ...

, a division of the U.S. Department of State *

Canadian Alliance The Canadian Alliance (french: Alliance canadienne), formally the Canadian Reform Conservative Alliance (french: Alliance réformiste-conservatrice canadienne), was a centre-right to right-wing federal political party in Canada that existed ...

, 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 ''wiktionary:Circa, circa'' (''latin''), meaning approximately * ''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 * 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 * Heavy Cruiser's US Navy hull classification