SID

Sid or SID may refer to:

People

 * Sid (given name), includes a list of people with the name

Science and technology

 * Sound Interface Device: the MOS Technology 6581 sound-generating chip used in some Commodore computers
 * Security Identifier, used by Microsoft
 * Sid blood group system
 * Saab Information Display in cars
 * Slew-induced distortion, in an amplifier
 * Source to image-receptor distance, in radiology
 * Sudden ionospheric disturbance, caused by a solar flare
 * Surface-induced dissociation, in mass spectrometry
 * System identification number, in wireless telephony
 * Source Identification codes, identifying marks on optical discs introduced by the International Federation of the Phonographic Industry
 * mSin3 interaction domain, a transcriptional repressor domain
 * .sid, MrSID image file extension
 * Sid (Debian), the code name for the 'unstable' distribution of the operating system

Entertainment

 * Sid (band), a Japanese rock band
 * Síd, a fairy mound in Irish folklore
 * Superman Is Dead, or S.I.D., an Indonesian rock band
 * Space Intruder Detector, satellite in the UK TV series UFO
 * Sid Vere, a fictional character from Doctors
 * The given name of the Cookie Monster is Sid.

Transport

 * Standard instrument departure, aircraft procedure
 * Amílcar Cabral International Airport, Sal Island, Cape Verde
 * Sidcup railway station (National Rail station code), London, England

Organizations

 * Danish General Workers' Union, former trade union in Denmark
 * Security and Intelligence Division, Singapore's Foreign intelligence agency
 * Servizio Informazioni Difesa, the Italian military secret service 1965-1977
 * Service for Research and Documentation, the Serbian intelligence agency
 * Society for Information Display
 * Society for International Development
 * Sport-Informations-Dienst, German sports media service
 * Special Investigations Division (disambiguation)

Places

 * Šid, Vojvodina, Serbia
 * Šíd, village in Slovakia
 * River Sid, in Devon, England

Other uses

 * Status–income disequilibrium, a political term
 * Sports information director