| Open Architecture Management | Academic & Science |
| Oamaru | Airport Code |
| Overseas Asset Management | Business |
| Oracle Access Management | Business |
| Office of Administrative Management | Business |
| Outcomes And Measurement | Business |
| Office of Acquisition Management | Business |
| Oregon Accounting Manual | Business |
| Orbital Angular Momentum | Chemistry |
| Opticians Association of Michigan | Community |
| Outdoor Advertising Magazine | Community |
| Opticians Association of Massachusetts | Community |
| Operation Administration And Maintenance | Computing |
| Object Attribute Memory | Computing |
| Optical and Atm | Computing |
| Operations Administration and Maintenance | Computing |
| Optional Assessment Material | Computing |
| Online Account Management | Computing |
| Object Authority Manager | Computing |
| Oracle Applications Manager | Computing |
| Oracle Access Manager | Computing |
| Operations Administration and Management | Computing |
| Object Access Model | Computing |
| Optical Absorption Microscope | General |
| OCP Accelerator Module | General |
| Oregon Accountability Model | General |
| Oralce Access Manager | General |
| Online Activity Matching | General |
| Officine Alfieri Maserati | General |
| Osaka Auto Messe | General |
| One Angstrom Microscope | General |
| Odin Account Manager | General |
| Older Americans Month | General |
| Online Account Manager | General |
| One Activity Membership | General |
| Old Age Man | General |
| Online Account ManagementSM | General |
| Officially Appointed Mechanism | General |
| Operators and Matrices | General |
| Optoelectronics and Advanced Materials | General |
| Order of Ancient Mysteries | General |
| Open Application Model | General |
| Office of Advanced Manufacturing | General |
| Offshore Account Manager | General |
| Opportunity Ability and Motivation | General |
| Once A Month | General |
| Operation Administrative and Maintenance | General |
| Ole Arve Misund | General |
| On A Mission | General |
| Ordo Annum Mundi | General |
| Operations Administration Maintenance | General |
| The Order Of Amber And Marigold | General |
| Order of Australia Medal | General |
| Office of Air and Marine | General |
| Open Air Meeting | General |
| Old Angry Man | General |
| Orthopaedic Associates of Muskegon | Medical |
| Orthopaedic Associates of Michigan | Medical |
| Office of Acquisitions Management | Military and Defence |
| Oamaru, New Zealand | Regional |
| Optical Authoring Manager | Softwares |
