CID may refer to:
Film
- C.I.D. (1955 film), an Indian Malayalam film
 - C.I.D. (1956 film), an Indian Hindi film
 - C. I. D. (1965 film), an Indian Telugu film
 - C.I.D. (1990 film), an Indian Hindi film
 
Television
Organizations
Police units
Other organizations
- Center for International Development, at Harvard University
 - Central Institute for the Deaf
 - Committee of Imperial Defence, a former part of the government of Great Britain and the British Empire
 - Conseil International de la Danse, an umbrella organization for all forms of dance in the world
 - Council of Industrial Design, a UK body renamed the Design Council
 - University of Colombo, Centre for Instrument Development, in Sri Lanka
 
Science and technology
Biology and medicine
- Clinical Infectious Diseases, a medical journal
 - Cytomegalic inclusion disease
 - Chromosomal Interacting Domain, a self-interacting domain in bacteria
 
Chemistry
- Collision-induced dissociation, a mass spectrometry mechanism
 - Compound identification number, a field in the PubChem database
 - Configuration interaction doubles, in quantum chemistry
 
Computing and telecommunications
- Caller ID, a telephone service that transmits the caller's telephone number to the called party
 - Card Identification Number, a security feature on credit cards
 - Cell ID, used to identify cell phone towers
 - Centro de Investigaciones Digitales of the Universidad de La Habana
 - Certified Interconnect Designer, a certification for printed circuit-board designers
 - CID fonts, a font file format
 
Other uses in science and technology
- Channel-iron deposits, one of the major sources of saleable iron ore
 - Controlled Impact Demonstration, a project to improve aircraft crash survivability
 - Cubic inch displacement, a measurement in internal combustion engines
 
Other uses
- Centro Insular de Deportes, an indoor sports arena in Spain
 - Chinatown–International District, Seattle
 - CID The Dummy, a video game
 - Combat Identification, the accurate characterization of detected objects for military action
 - Common-interest development, a form of housing
 - Community improvement district, an area within which businesses are required to pay an additional tax
 - The Eastern Iowa Airport (IATA code CID), serving Cedar Rapids, Iowa
 - Corpus des inscriptions de Delphes, a compendium of ancient Greek inscriptions from Delphi
 
See also
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