| Orange Coast College's | Academic & Science |
| Oral Communication Center | Academic & Science |
| Occurrence | Academic & Science |
| Office of The Comptroller of The Currency | Accounts and Finance |
| Other Charges and Credits | Accounts and Finance |
| Coca | Airport Code |
| Open Cash Credit | Banking |
| Outer Case Code | Business |
| O'okiep Copper Company | Business |
| Optical Cable Corporation | Business |
| Oklahoma Corporation Commission | Business |
| Ohno Continuous Casting | Business |
| Off Camber Crawler | Business |
| Old Corrugated Cardboard | Business |
| Orange County Choppers | Business |
| Old Corrugated Container | Business |
| organization of the Caribbean community | Business |
| Osteopathic Continuous Certification | Certifications |
| Ohio Cardinal Conference | Community |
| Overlake Christian Church | Community |
| Operation Christmas Child | Community |
| Orange County Canaanites | Community |
| Original Character Creation | Community |
| Oswaldtwisle Community Church | Community |
| Obligatory Cinema Content | Community |
| Office of Child Care | Community |
| Old Corrugated Containers | Community |
| Owensboro Community College | Community |
| Office of Community Care | Community |
| Overseas Committee Chair | Community |
| Ocean Cruising Club | Community |
| Obscure Canon Character | Computer Assembly Language |
| Occasionally Connected Computing | Computing |
| One Click Computer | Computing |
| Obligatory Classical Content | Computing |
| Optical Cable Code | Computing |
| Open Code Collection | Computing |
| Output Control Cell Counter | Computing |
| Originating Call Control | Computing |
| Overclockers Club | Computing |
| Oracle Compute Cloud | Computing |
| Oracle Commerce Cloud | Computing |
| Oracle Cloud at Customer | Computing |
| Open Cooperative Computing | Computing |
| Orange C Compiler | Computing |
| Open Cloud Computing | Computing |
| Occam.Fi | Cryptocurrency |
| Object Class Cardinality | Database Management |
| Object Component Control | Database Management |
| Off-campus College | Educational Institute |
| Orange Coast College | Educational Institute |
| Oakland Community College | Educational Institute |
| Onondaga Community College | Educational Institute |
| Ozark Christian College | Educational Institute |
| Owens Community College, Toledo, Ohio | Educational Institute |
| Ocean County College | Educational Institute |
| Olney Central College | Educational Institute |
| Open Circuit Characteristics | Electronics |
| Old Chrysler Corporation Auto Club | General |
| Octagon Car Club | General |
| Oldtimer and Cars Club | General |
| Opel Corsa Club | General |
| Opala Clube Catanduva | General |
| Osprey Custom Cars | General |
| Old Concept Cars | General |
| Operational Control Center | General |
| Oregon Convention Center | General |
| Operation Care and Comfort | General |
| Online Curriculum Centre | General |
| Output Circuit Check | General |
| Oblique Coherent Contrast | General |
| Old Classic Car | General |
| Obsessive Compulsive Cosmetics | General |
| Ozaukee Corvette Club | General |
| Off Camber Crawlers | General |
| Open Cloud Consortium | General |
| Ohio Corvette Club | General |
| Original Corvette Club | General |
| Ouachita Correctional Center | General |
| Okanagan Corvette Club | General |
| Okoboji Classic Cars | General |
| Opel Car Collection | General |
| Outside the Classroom Curriculum | General |
| Oxidation Catalytic Converter | General |
| Ottawa Citroen Club | General |
| Oldsmobile Club of Canada | General |
| Organic Cotton Coil | General |
| Oldsmobile Cutlass Coupes | General |
| Ohio Cobra Club | General |
| Old Celica Club | General |
| Outsiders Car Club | General |
| Oldtimer Classic Cars | General |
| Oldie Car Cover | General |
| Ontario Camaro Club | General |
| Open Charging Station Controller | General |
| On Command Connection | General |
| Old Car Club | General |
| Order of Chaos and Corruption | General |
| Over-the-Counter Choppers (generic false teeth) | General |
| Osiris Chess Club, Homewood, Alabama | General |
| Obsessive Complusive Cosmetics | General |
| Owl City Concert | General |
| Open Commons Consortium | General |
| Operation Control Center | General |
| OHNO Continuous Cast | General |
| Operating and Control Console | General |
| Open Characteristic Curve | General |
| Officer Course Code | General |
| Ohio Consumers Counsel | General |
| Olympic Corrections Center | General |
| Office of Consumer Counsel | General |
| Over Cutter Camera | General |
| OpenCitations Corpus | General |
| Optical Cross Connect | General |
| Object Class Code | Governmental |
| Counsellor to the Commissioner | Governmental |
| Organic Commodity Commission | Governmental |
| Officer's Candidate | Governmental |
| Omaha Cornbelt Council | Governmental |
| Occupational Character Class | Jobs |
| Odd Cross-correlation | Maths |
| Occasionally | Medical |
| Occiput | Medical |
| Occupation | Medical |
| Out of Character Chat | Messaging |
| Operations Computer Center | Military and Defence |
| Orange County Chapter | Regional |
| Ontario Chamber of Commerce | Regional |
| Object-oriented Compiler Construction | Softwares |
| Office of Contract Compliance | Space Science |
| Operations Control Center | Space Science |
| One City Challenge | Sports |
| Options Clearing Corporation | Stock Exchange |
| Online Credit Charging | Telecommunication |
| Optical Communication Channel | Telecommunication |
| Other Common Carrier | Telecommunication |