OCS

OCS or Ocs may refer to:

Places

 * Öcs, a village in Veszprém county, Hungary
 * Outer Continental Shelf, a maritime federal land zone beyond the jurisdiction of the United States

Music

 * Ocean Colour Scene, an English rock group
 * Thee Oh Sees, an American experimental rock band

Psychiatry and medicine

 * Obsessive-compulsive syndrome or obsessive-compulsive disorder, a psychiatric anxiety disorder
 * Ontario Cannabis Store, the store name of the Ontario Cannabis Retail Corporation

Science and technology

 * Open Collaboration Services, for integration of web services and communities into desktop and mobile applications, an open and vendor-independent API
 * Office of the Chief Scientist (Australia), a part of Department of Innovation, Industry, Science and Research
 * Amiga Original chipset, a Commodore Amiga chipset
 * Carbonyl sulfide, a chemical compound with the formula OCS
 * Microsoft Office Communications Server, a software product
 * OCS Inventory (Open Computer and Software Inventory), an application which inventories IT assets
 * Online charging system, a system allowing providers of communication services to charge customers based on service usage
 * Overhead contact system, a system which provides electric power to trains

Schools and alumni associations

 * Officer Candidate School or Officer Cadet School, a training establishment in many countries where military officers are trained
 * Oklahoma Christian School
 * Old Cliftonian Society, the society for the alumni of Clifton College, Bristol, England
 * Opelika City Schools, a school district headquartered in Opelika, Alabama, United States
 * Senator O'Connor College School in Parkwoods, Ontario, Canada

Other uses

 * Federation of Old Cornwall Societies or sometimes OCS, a Cornish history charity
 * OCS (television), a French series of dedicated movies/series TV channels operated by Orange S.A.
 * Old Church Slavonic, a Slavic language which developed in the 9th century
 * Office of Community Services, a US Federal Government agency
 * On course side, a term meaning that a sailboat has crossed the start line of a race early
 * Operational Combat Series, a game series from The Gamers and Multi-Man Publishing
 * Ontario Cannabis Retail Corporation, a Crown corporation that is the sole legal online retailer and wholesale distributor of recreational cannabis and cannabis infused products in the Canadian province of Ontario.