OCS

OCS is a three-letter-acronym (or TLA) that may stand for:

• Carbonyl sulfide
• Obsessive-compulsive scale
• Obsessive-compulsive symptoms
• Ocean Colour Scene
• Office of Career Services (several)
• Office of the Chief Scientist (Australia)
• Office of Coast Survey (NOAA)
• Office coffee service
• Office of Community Services
• Office of Cyberspace Security (US)
• Officer Cadet School (several military)
• Officer Candidate School (several military)
• Offshore Constitutional Settlement (Australia)
• Oklahoma Climatological Survey
• Old Church Slavonic
• Onboard computer system
• Open Channel Solutions Inc. (ocs.com)
• Open Content Syndication
• Operations control software
• Operational Control Segment (GPS)
• Operational control system (avionics)
• Operator control station
• Optical Calibration Sphere
• Optical control system
• Optical convergence switch
• Oregon Climate Service
• Original Amiga chipset or "old chipset" (Commodore Amiga)
• Ouachita Christian School (ocs.org)
• Outer continental shelf
• Overhead contact system
• OCS Canada ("Overseas Courier Service", ocs.ca)