| O.A.M. | Medal of the Order of Australia 
| Others |
| OA&M | Operations Administration and Maintenance
| Others |
| OAM | Object Access Model
| Others |
| OAM | Object Attribute Memory
| Others |
| OAM | Object authority manager
| Others |
| OAM | OCP Accelerator Module
| Others |
| OAM | Odin Account Manager
| Others |
| OAM | Office of Acquisition Management
| Others |
| OAM | Office of Acquisitions Management
| Others |
| OAM | Office of Administrative Management
| Others |
| OAM | Office of Advanced Manufacturing
| Others |
| OAM | Office of Air and Marine
| Others |
| OAM | Officially Appointed Mechanism
| Others |
| OAM | Officine Alfieri Maserati
| Others |
| OAM | Offshore Account Manager
| Others |
| OAM | Old Age Man
| Others |
| OAM | Old Angry Man
| Others |
| OAM | Older Americans Month
| Others |
| OAM | Ole Arve Misund
| Others |
| OAM | On A Mission
| Others |
| OAM | Once A Month
| Others |
| OAM | One Activity Membership
| Others |
| OAM | One Angstrom Microscope
| Others |
| OAM | Online Account Management
| Others |
| OAM | Online Account ManagementSM
| Others |
| OAM | Online Account Manager
| Others |
| OAM | Online Activity Matching
| Others |
| OAM | Open Air Meeting
| Others |
| OAM | Open Application Model
| Others |
| OAM | Open Architecture Management
| Others |
| OAM | Operation Administration And Maintenance
| Others |
| OAM | Operation Administrative and Maintenance
| Others |
| OAM | Operations administration and management
| Others |
| OAM | Operations Administration Maintenance
| Others |
| OAM | Operators and Matrices
| Others |
| OAM | Opportunity Ability and Motivation
| Others |
| OAM | Optical Absorption Microscope
| Others |
| OAM | Optical and Atm
| Others |
| OAM | Optical Authoring Manager
| Others |
| OAM | Opticians Association of Massachusetts
| Others |
| OAM | Opticians Association of Michigan
| Others |
| OAM | Optional Assessment Material
| Others |
| OAM | Optoelectronics and Advanced Materials
| Others |
| OAM | Oracle Access Management
| Others |
| OAM | Oracle Access Manager
| Others |
| OAM | Oracle Applications Manager
| Others |
| OAM | Oralce Access Manager
| Others |
| OAM | Orbital Angular Momentum
| Others |
| OAM | Order of Ancient Mysteries
| Others |
| OAM | Order of Australia Medal
| Others |
| OAM | Ordo Annum Mundi
| Others |
| OAM | Oregon Accountability Model
| Others |
| OAM | Oregon Accounting Manual
| Others |
| OAM | Orthopaedic Associates of Michigan
| Others |
| OAM | Orthopaedic Associates of Muskegon
| Others |
| OAM | Osaka Auto Messe
| Others |
| OAM | Outcomes And Measurement
| Others |
| OAM | Outdoor Advertising Magazine
| Others |
| OAM | Overseas Asset Management
| Others |
| OAM | The Order Of Amber And Marigold
| Others |