| Ocean Products Center | Academic & Science |
| Ordinary Portland Cement | Academic & Science |
| Oligomeric Proanthocyanidins | Academic & Science |
| Online Public Catalog | Academic & Science |
| Oligomeric ProanthoCyanidin | Academic & Science |
| Oodua Peoples Congress | Associations & Organizations |
| Q C Optics, Inc. | Business |
| Opel Performance Centre | Business |
| Oglethorpe Power Corp | Business |
| Operations Procurement Contracts | Business |
| OPTI Canada, Inc. | Business |
| Ontario Press Council | Business |
| Oglethorpe Power Corporation | Business |
| Openess, Productivity, Collaboration | Business |
| Open Plant Cleaning | Business |
| Onondaga Pathways to Careers | Business |
| One Person Company | Business |
| Otsuka Pharmaceutical Company | Business |
| Only Perfect Church | Community |
| Odua Peoples Congress | Community |
| Oxford Park Commission | Community |
| Orthodox Presbyterian Church | Community |
| Overseas Press Club | Community |
| Overland Park Cinemas | Community |
| Overland Park Cinema | Community |
| Oklahoma Premier Clubs | Community |
| Optical Proximity Correction | Computer Hardware |
| Operator Presence Control | Computer Hardware |
| Optical Processing Calibration | Computing |
| Optical Photo Conductor | Computing |
| Online Photo Center | Computing |
| On Programmable Chip | Computing |
| Originating Point Codes | Computing |
| Oracle Pre-Compiler | Computing |
| Output Packet Counter | Computing |
| Own Point Code | Computing |
| Open Packaging Conventions | Computing |
| On Package Cache | Computing |
| Operating Centre | Computing |
| Off Premise Contact | Contact |
| Ole for Process Control | Database Management |
| Optical Passive Component | Electronics |
| Originating Point Code | Electronics |
| Organic Photo Conductor | Electronics |
| Optimum Power Control | Electronics |
| Optimum Power Calibration | Electronics |
| Optimal Pressable Ceramic | Electronics |
| Open Platforms Communication | General |
| Oracle Public Cloud | General |
| Ontario Prospect Challenge | General |
| Outdoor Pursuits Centre | General |
| Oh the Pitiful Collation | General |
| Ocean Protection | General |
| Outpatient Procedure Component | General |
| Orthotic Prosthetic Center | General |
| Optional Payment Charge | General |
| Oil Primary Control | General |
| Open Productive Communications | General |
| Occupant Protection for Children | General |
| Official Pace Car | General |
| Off Peak Car | General |
| Oil Performance Check | General |
| Open Carriage | General |
| Offshore Patrol Cutter | General |
| Office Of People's Counsel | General |
| Ocean Prediction Center | General |
| Office of the People's Counsel | General |
| Programmers Connection | General |
| Openness Productivity and Connectivity | General |
| Opel Performance Cars | General |
| Outside Public Contact | General |
| Office Pipe Cleaner | General |
| Online Parish Clerks | General |
| Ole For Proccess Control | General |
| Older Persons' Commission | General |
| Oongan Peace Crew | General |
| Oligomere Proantho Cyanidin | General |
| Oceans Players Club | General |
| Other Parks Corrector | General |
| Openness Productivity And Collaboration | General |
| Other Peoples' Clothes | General |
| Openess Productivity and Collaboration | General |
| Pest Control | General |
| Opel Performance Center | General |
| Optimal Performance Calculator | General |
| One Page Checkout | General |
| Open Pixel Control | General |
| Oregon Psychoanalytic Center | General |
| Odstock Parish Council | Governmental |
| Office of Police Complaints | Governmental |
| Order of Protective Custody | Governmental |
| Objective Performance Criteria | Governmental |
| Open Process Control | Governmental |
| Ocean Protection Council | Governmental |
| Opel Performance Car | Governmental |
| Ontario Police College | Governmental |
| Office of the Parliamentary Counsel | Governmental |
| Online Parish Clerk | Jobs |
| OutPatient Clinic | Medical |
| Older Person`s Clinic | Medical |
| OroPharyngeal Candidiasis | Medical |
| Out-Patient Care | Medical |
| Operating Peoples Computer | Messaging |
| Original Post Count | Messaging |
| Optical Particle Counter | Physics Related |
| Ovamboland People's Congress | Regional |
| OLE (Object Linking and Embedding) for Process Control | Softwares |
| Open Platform Communications | Telecommunication |
