| Office of Marine Programs | Academic & Science |
| Overlay Management Protocol | Business |
| Orphan Medicinal Products | Business |
| The Open Mind Project | Business |
| Obagi Medical Products | Business |
| Online Marketing and Publishing | Business |
| Office Managing Partner | Business |
| Open Marketing Project | Business |
| Officine Meccaniche Percivale (in Italian) Percentric Mechanical Workshops | Business |
| Observation Management Project | Business Management |
| Office of Management and Policy | Business Management |
| Openvas Management Protocol | Business Management |
| Orotate Monophosphate | Chemistry |
| Open Monograph Press | Community |
| Orbital Music Park | Community |
| Other Major Parks | Community |
| Osaka Media Port | Community |
| Optimization Memory Processor | Computing |
| Operations Maintenance Platform | Computing |
| Oracle Mobile Protocol | Computing |
| Online Marketing Platform | Computing |
| Open Management Protocol | Computing |
| OpenMP Directives | Computing |
| Online Media Protection | Computing |
| Open Multi-Processing | Computing |
| Overton Moore Properties | General |
| Oneida Molded Plastics | General |
| Organic Modified Polymer | General |
| Oasis Midstream Partners | General |
| Optional Metallic Paint | General |
| Officine Meccaniche Percivale | General |
| Office of Multicultural Programs | General |
| Office of Marijuana Policy | General |
| Order Maintenance Policing | General |
| OneModelPlace.Com | General |
| A One Minute Praising | General |
| Onetas Mark Productions | General |
| One Model Place | General |
| October Mountain Products | General |
| Ohio Machined Products | General |
| Ohio Model Products | General |
| Oh My Pizza | General |
| Observatoire Midi Pyrenees | General |
| Obras Misionales Pontificias | General |
| Orbea Monocoque Performance | General |
| Osteoblast Milk Protein | General |
| Opportunity Music Project | General |
| Oh My Pudding | General |
| Ozark Mountain Poultry | General |
| Orthogonal matching pursuit | General |
| oh my Primus | General |
| Oh My Panda | General |
| Overseas Missions Practicum | General |
| Ozark Mission Project | General |
| One Man Parkour | General |
| Oh My Pete | General |
| Open Mobile Platform | General |
| Office of Management Programs | Governmental |
| Ontario Midwifery Program | Medical |
| Osteopathic Medical Profession | Medical |
| Outer Membrane Protein | Medical |
| Olfactory Marker Protein | Medical |
| omeprazole | Medical |
| Ophthalmic Medical Practitioner | Medical |
| Olympic Medical Physicians | Medical |
| Oh My Patience | Messaging |
| Operational Mission Profile | Military and Defence |
| Operations and Maintenance Plan | Space Science |
