CA

CA may stand for:

*Circa (ca.)
*Class A

People and organizations

*Air China, IATA airline designator (CA)
*Bureau of Consular Affairs, a division of the US Department of State
*CA, Inc. (formerly known as Computer Associates)
*Canadian Academy, an international school in Kobe, Japan
*Canadian Alliance, a former Canadian political party
*C&A stores
*Carmelo Anthony, NBA player
*Cary Academy, a North Carolina school
*Catamarca Province, in Argentina
*Cayman Airways, airline
*Central Administration
*Certified archivist
*Channel America, a defunct US television network
*Chartered accountant (CA)
*Chief of Army (Australia)
*Christian anarchist, an adherent of Christian anarchism
*Christina Aguilera, singer and songwriter
*Citizens' Alliance, a political party in Trinidad and Tobago
*Civil Affairs, the official name for military units that conduct civil-military operations
*Classic Army, a Hong Kong based manufacturer of airsoft replicas
*Cocaine Anonymous
*Confidentiality Agreement
*Conscientious Arsonists, Greek terrorist organization
*Countryside Alliance, UK
*Creative Assembly, PC Game Developer
*Crédit Agricole
*Cricket Australia
*Cycling Australia

Regional

*Cagliari, capital of the island of Sardinia, Italy (CA)
*California (United States postal abbreviations)
*Canada, ISO 3166, FIPS Pub 10-4 and obsolete NATO digram (CA)
**.ca is also the ccTLD for Canada
*Carlisle, the United Kingdom postcode for the region in north-western England served by the Carlisle postal sorting office
*Catalan language, ISO 639 alpha-2 language code (ca)
*Central America
*Cả River, a river in Laos and Vietnam

cience and medicine

*Calcium, symbol for the chemical element (Ca)
*Cancer/Carcinoma
*Cancer Antigen, a diagnostic substance indicative of abnormal cellular growth
*Carbonic anhydrase
*Cardiac arrest
*Cellular automaton
*Chemical Abstracts, an index of the scientific literature in chemistry and related fields, supplemented by abstracts
*Chromatic aberration
*Conversation analysis
*"Cornu ammonis", names of hippocampal subregions

Technology

*Armored cruiser, U.S. Navy hull classification symbol, pre 1930 (CA)
*Centiampere, an SI unit of electric current (cA)
*Certificate authority (or Certification Authority) (CA)
*Computer Animation (CA)
*Controlled atmosphere
*Cultural algorithm (CA)
*Cyanoacrylate, superglue
*Heavy cruiser, U.S. Navy hull classification symbol (CA)
*Conditional access, Conditional Access (Broadcast)
*Compressed Air, such as "CA Piping" or "CA System" etc.

Other

* CA, Casio' s mobile phones in Japan.