OCS

OCS may refer to:

• Carbonyl sulfide, a chemical compound with the formula OCS
• Officer Candidate School or Officer Cadet School, a training establishment in many countries where military officers are trained
• Oklahoma Christian School
• Old Church Slavonic, a Slavic language developed in the 9th century
• Outer Continental Shelf, maritime federal lands beyond the jurisdiction of the United States
• Overhead contact system, a method of transmitting electrical energy to trams, trolleybuses or trains
• Federation of Old Cornwall Societies or sometimes OCS, a Cornish history charity
• Odebrecht Administradora Corretora de Seguros. Lda., an Odebrecht subsidiary
• Office of Community Services Block Grant, a program in the U.S. run by the Administration for Children and Families
• Organized Crime Section of the Ontario Provincial Police
• Owl Correspondence School, the alma mater of X the Owl from the The Neighborhood of Make-Believe in the TV series Mister Rogers' Neighborhood
• Online Charging System, a system allowing Communication Service Providers to charge their customers, in real time, based on service usage
• Office Coffee Service, a service that delivers coffee supplies to businesses

Psychiatry and medicine

• Obsessive-compulsive syndrome or obsessive-compulsive disorder, a psychiatric anxiety disorder
• Online Consultation Service (telemedicine)

Music and bands

• Ocean Colour Scene, an English rock group
• The Ohsees (formerly the OCS), an experimental rock band
• Omul cu Sobolani, a Romanian alternative rock group

Companies

• One Complete Shithole a privately owned company offering a full range of property support services across a wide range of market sectors

Technology

• Office Communications Server, a Microsoft software product
• OCS Inventory ("Open Computer and Software"), an application that enables users to inventory their IT assets
• Open Communication Solution, a snom software product
• Original Chip-Set or "old chipset" (Commodore Amiga)
• Open Conference Systems, open-source conference management software
• Open Collaboration Services, open and vendor independent API to access online services, part of the Social Desktop

Sports

• Outback Champions Series Professional tennis events.
• Owls Crime Squad, a football firm (hooligan firm) associated with Sheffield Wednesday
• On course side, meaning that a sailboat has crossed the start line of a race early

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