| One Piece Magnesium | Academic & Science |
| Other Peoples Money | Business |
| Outsourced Program Management | Business |
| Online Performance Marketing | Business |
| Organizational Process Modelling | Business |
| 1PM, P.L.C. | Business |
| Opta Minerals Incorporated (de-listed) | Business |
| Official Parallel Market | Business |
| Organizational Process Management | Business |
| Online Project Management | Business |
| Office of Pest Management | Business Management |
| Owner/president Management | Business Management |
| Operations and Personnel Management | Business Management |
| Overflow of Praise Music | Community |
| Original Pinoy Music | Community |
| One Punch Man | Community |
| Opening People's Minds | Community |
| Open Peoples Minds | Community |
| Over Priced Magazine | Community |
| Original Pilipino Music | Community |
| Other People's Music | Community |
| Official Playstation Magazines | Community |
| Object Properties Manager | Computing |
| Optical Performance Monitor | Computing |
| Original Program Model | Computing |
| Output Protection Management | Computing |
| Open Proxy Monitor | Computing |
| Oracle Property Manager | Computing |
| Optical Passthru Module | Computing |
| Open Policy Meeting | Computing |
| Open Manufacturing Platform | Computing |
| Original Programming Model | Computing |
| Organizational Performance Management | Computing |
| Omega Protocol Money | Cryptocurrency |
| Oracle Process Manufacturing | Database Management |
| Optical Power Meter | Electronics |
| Orientations of Proteins in Membranes | General |
| Ohio Precious Metals | General |
| Oxford Performance Materials | General |
| Outsourced Program Manager | General |
| Office of Personnel Managment | General |
| Original Peoples Mind | General |
| Occupational Psychology Matters | General |
| Open PostgreSQL Monitoring | General |
| Our Peoples' Money | General |
| Office of Policy and Management | Governmental |
| Office of Purchasing Management | Governmental |
| Organisasi Papua Merdeka | Governmental |
| Organic Pest Management | Governmental |
| Office of Price Management | Governmental |
| Optimal Probability Measure | Maths |
| Occupational Performance Model | Medical |
| Office Personnel Management | Messaging |
| Office of Personnel Management | Military and Defence |
| Operations Per Minute | Military and Defence |
| Office of The Program Manager | Military and Defence |
| Operational Procedues Manual | Military and Defence |
| Online Process Monitor | Networking |
| One-Province Minor | Regional |
| Offices Professional Missionaries | Regional |
| Object-process Methodology | Softwares |