CID may refer to:
In criminal investigation:
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 American Express 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
- 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:
See also
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