CID may refer to:

In criminal investigation:

• Criminal Investigation Department, the branch of all British Police and many other Commonwealth police forces to which plain clothes detectives belong
• United States Army Criminal Investigation Command (USACIDC), of which the operations division is commonly abbreviated to CID.
• IRS Criminal Investigation Division, agency investigation violations of the U.S. Internal Revenue Code
• Criminal Investigation Department (Ireland), an Irish police unit during the Irish Civil War (1922-23)

In media:

• C.I.D. (film), a 1956 Indian Hindi film
• "C.I.D.", an Indian television serial about a team of detectives belonging to the Crime Investigation Division of Mumbai Police

In science and technology

• C.I.D.+, a certification for printed circuit-board designers
• Caller ID, a telephone intelligent network service that transmits the caller's telephone number to the called party's telephone equipment during the ringing signal
• Card Identification Number, a security-feature on credit cards
• Collision-induced dissociation, a mechanism in mass spectrometry by which to fragment molecular ions in the gas phase
• Combat Identification, accurate characterization of detected objects for military action
• Configuration Interaction Doubles: A variational quantum-chemical method for calculating partly-correlated ground states
• Content-ID, an URI scheme (cid:) that allows the use of MIME within email
• Controlled Impact Demonstration, a joint project between NASA's Dryden Flight Research Center and the Federal Aviation Administration
• Cubic inch displacement, a measurement in internal combustion engines
• University of Colombo, Centre for Instrument Development, an organization within the Department of Physics, University of Colombo, Sri Lanka
• CID fonts, a form of Type 1, PostScript font
• Chemical IDentifier for molecular structures in PubChem
• Charge Injection Device, a solid state imaging sensor similar to a CCD

In other fields:

• Central Institute for the Deaf, a school for the deaf that teaches students using the oralism approach to education
• Committee of Imperial Defence, an important part of the government of Great Britain and the British Empire from just after the Second Boer War until the start of World War II
• Conseil International de la Danse, an umbrella organization for all forms of dance in the world
• Creativity and Innovation Day, an April 21 observance
• Center for International Development, a think tank in the John F. Kennedy School of Government at Harvard University, 1998-present
• CID, the IATA code for The Eastern Iowa Airport in Cedar Rapids, Iowa
• Common Interest Development
• Community improvement district
• Constructions Industrielles Dijonaises CID former automobile manufacturer, Dijon , France

[edit] See also

• Cid

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