| Acronym | Definition |
|---|
| OCC | Overclockers Club (website) |
| OCC | Other Common Carrier |
| OCC | Ohno Continuous Casting (high-quality technique for drawing copper) |
| OCC | Ordened Computer Chaos (LAN-Party in Belgium) |
| OCC | Onondaga Cycling Club (Syracuse, NY) |
| OCC | Oxford Community Church (UK) |
| OCC | Ontario College Counsellors |
| OCC | Occupational Character Class (RIFTS) |
| OCC | Optical Connection Controller (IEEE) |
| OCC | Originating Call Control (Cisco) |
| OCC | Odd Crosscorrelation |
| OCC | Operator Control Command |
| OCC | Outage Control Center (nuclear power) |
| OCC | Officially Certified Chronometer |
| OCC | Ocean Carrier Code |
| OCC | Officer Course Code |
| OCC | Ontario Computer Centre |
| OCC | Officer Classification Code |
| OCC | Organización para los Comunistas Canarios (Organization for Canarian Communists; Canary Islands) |
| OCC | Onsite Construction Contractor |
| OCC | Operational/Operations Control Center |
| OCC | Optical Control Card (Sycamore) |
| OCC | Operations Clerical Coordinator |
| OCC | Outgoing Call Completions |
| OCC | On-Chip Clocking |
| OCC | Original Code Consulting (Denver, CO) |
| OCC | Opale Classic Cars (French automobile club) |
| OCC | Odawara Christian Center |
| OCC | Other Costs and Credits (accounting component) |
| OCC | Opel Classic Club (automotive club; Romania) |
| Occ | Occulting (nautical) |
| OCC | Opportunity Cost of Capital (finance) |
| OCC | Organochlorine Compound |
| OCC | Ontario Chamber of Commerce |
| OCC | Outer Critics Circle (est. 1949) |
| OCC | One Cycle Control (switching power converters) |
| OCC | Open-Loop Control |
| OCC | Onion Creek Crawdaddies (band) |
| OCC | Operating Characteristic Curve |
| OCC | Operation Christmas Child |
| OCC | Optical Cable Corporation (Roanoke, VA) |
| OCC | Occasionally Connected Computing (mobile computing & WiFi) |
| OCC | Orthogonal Complementary Code |
| OCC | Old Catholic Church |
| OCC | Office of College Computing (various schools) |
| OCC | Orchid Country Club (Singapore) |
| OCC | Orthodox Catholic Church |
| OCC | Orange County Criminals (gang; California) |
| OCC | Oakland Community College (Detroit, MI) |
| OCC | Office Congolais de Contrôle (Democratic Republic of Congo ISO correspondent member) |
| OCC | Operation Command Centre (Canada) |
| OCC | Online Career Center |
| OCC | Orange County Choppers (Orange County, NY) |
| OCC | Other Charges and Credits |
| OCC | One Campus Challenge (various schools) |
| OCC | Old Corrugated Cardboard (recyclable waste) |
| OCC | Office of Citizen Complaints (San Francisco Police Department; California) |
| OCC | Ocean County College (Toms River, NJ) |
| OCC | Office of Climate Change (UK) |
| OCC | Ozark Christian College |
| OCC | Old Corrugated Container (wood pulp) |
| OCC | Ontario Casino Corporation |
| OCC | Oakmont Country Club (Oakmont, PA) |
| OCC | Owensboro Community College (Kentucky) |
| OCC | Old Corrugated Cartons (pulp and paper industry) |
| OCC | Overseas Coordination Conference |
| OCC | Office of the Corporation Counsel (Washington, DC) |
| OCC | Online Content Creation (Internet) |
| OCC | Office of Child Care |
| OCC | Operation Control Centre (UK) |
| OCC | Optimistic Concurrency Control |
| OCC | Options Clearing Corporation |
| OCC | Orange Coast College (Costa Mesa, California) |
| OCC | Order of the Caribbean Community |
| OCC | Oregon Convention Center (Portland, OR) |
| OCC | Object Class Code |
| OCC | Office of Communications and Computing (various schools) |
| OCC | Office of the Chlidren's Commissioner (New Zealand) |
| OCC | Occupancy Rate |
| OCC | Office of the Comptroller of the Currency |
| OCC | Oil Coordination Committee |
| OCC | Oklahoma Corporation Commission |
| OCC | Onondaga Community College (Syracuse, NY) |
| OCC | Operating Company Contribution |
| OCC | Office of the Chief Counsel |
| OCC | Onset Computer Corporation |
| OCC | Orthodox Church of Canada |
| OCC | Oakton Community College |
| OCC | Orinda Country Club (California) |
| OCC | Office of Career Counseling (various schools) |
| OCC | Orange County Council (Boy Scouts of America) |