SID
- Amílcar Cabral International Airport
- CID (disambiguation)
- Commodore International
- Cookie Monster
- Danish General Workers' Union
- International Federation of the Phonographic Industry
- MrSID
- River Sid
- SIDS (disambiguation)
- Saab Information Display
- Security Identifier
- Security and Intelligence Division
- Self-identification
- Service for Research and Documentation
- Servizio Informazioni Difesa
- Sid (Debian)
- Sid (band)
- Sid (given name)
- Sid Vere
- Sid blood group system
- Sidcup railway station
- Slew-induced distortion
- Society for Information Display
- Society for International Development
- Sound Interface Device
- Source to image-receptor distance
- Special Investigations Division (disambiguation)
- Sport-Informations-Dienst
- Sports information director
- Standard instrument departure
- Status–income disequilibrium
- Sudden ionospheric disturbance
- Superman Is Dead
- Surface-induced dissociation
- Syd (disambiguation)
- System identification number
- Síd
- Šid
- Šíd