• Amilcar Cabral International Airport, Sal Island, Cape Verde.
• Standard Instrument Departure at airports, also referred to as “Departure Procedure” (DP)
• Security and Intelligence Department, Singapore foreign intelligence service
• Sensory Integration Dysfunction
• Society for Information Display, a professional society dedicated to the study of the physics and engineering of display devices
• Source Image Distance in Diagnostic Radiography (previously referred to as FFD)
• Servizio Informazioni Difesa, Italian military secret service from 1965 to 1977 (replaced by the SISMI)
• Shared Information/Data Model
• Sudden infant death syndrome
• Sudden Ionospheric Disturbance
• Sports information director, a position title similar to PR Director or Press Secretary, usually within University/School Systems athletic departments
• Scientific Investigation Division of LAPD
• Saab Information Display inside most Saab automobiles built since 1994

In fiction:

• Space Intruder Detector, an early-warning satellite in the British television series UFO

In music:

• "Abuse of SID", a song by Hurt, from their second album Vol. II

In technology:

• MOS Technology SID, the Sound Interface Device (built-in sound chip) used in the Commodore CBM-II, Commodore 64 and Commodore 128 home computers
• Security Identifier, a unique alphanumeric character string assigned by a Windows Domain controller
• Silence Insertion Descriptor, a special frame in VOIP audio codecs to enable Comfort noise
• A story identifier which uniquely identifies an article in Slash-based sites, such as Slashdot
• System Identification Number Identifies an Analog, TDMA or CDMA system
• NGOSS Shared Information/Data Model, Definition of NGOSS’s common Information Model
• Seamless Image Database (See MrSID)
• Session ID

See also

• Sid, a given name