OCC is an acronym for several American colleges:
- Oakland Community College, Michigan
- Oakton Community College, Illinois
- Ocean County College, New Jersey
- Onondaga Community College, New York
- Orange Coast College, California
- Ozark Christian College, Missouri
In sports, OCC can mean:
- Oceania Club Championship, an international club competition organised by the Oceania Football Confederation
- Oceanian Cycling Confederation, Oceania's branch of the Union Cycliste Internationale
- Either of two Ohio High School Athletic Conferences in the U.S.:
- Ohio Capital Conference
- Ohio Cardinal Conference
- Oldswinford CC, an amateur British cricket club
- Optimists Cricket Club of central Luxembourg
- Ottawa Curling Club of Canada
- OC Châteaudun, French association football club
OCC can also be an abbreviation for certain concepts, such as:
- Occasionally Connected Computing in computing
- Optimistic Concurrency Control in computing
- Organic Composition of Capital, a theory within Marxian economics
- Opportunity Cost of Capital in finance
- Ohno Continuous Casting in metallurgy
- Open Cloud Consortium, a non-profit organization
Other meanings of OCC include:
- Orange County, California
- Ocean Cruising Club - a UK-based organisation for long-distance yacht cruisers
- Office of the Comptroller of the Currency - a bureau of the U.S. Treasury Department
- Officer Candidates Course - a United States Marine Corps training program
- The Official UK Charts Company
- Ontario Crafts Council
- Operation Christmas Child - an outreach programme run by Samaritan's Purse
- Options Clearing Corporation - a clearing organization
- Orange County Choppers - a custom motorcycle manufacturer from New York, featured in Discovery Channel's American Chopper series
- Oregon Convention Center - Portland
- Osborne Computer Corporation - an American computer company
- Oswald Chesterfield Cobblepot, the birthname of "The Penguin" from Batman.
- Oceanic Control Center - an air traffic control position that covers oceanic airspaces.
- The Oxford Companion to Chess - an encyclopedia of chess
- Optical Cable Corporation – manufacturer of fiber optic and copper datacom cabling and connectivity products.