| OAP | Audio Products 
| Others |
| OAP | Oakland Acupuncture Project
| Others |
| OAP | Obtain Analyse Present
| Others |
| OAP | Ocean Acidification Program
| Others |
| OAP | Ocean Action Plan
| Others |
| OAP | Oceanic Automation Program
| Others |
| OAP | Odessa Aviation Plant
| Others |
| OAP | Off Axis Parabola
| Others |
| OAP | Off Axis Parabolic
| Others |
| OAP | Office for Asia and the Pacific
| Others |
| OAP | Office of Academic Programs
| Others |
| OAP | Office of Acquisition Policy
| Others |
| OAP | Office of Antimicrobial Products
| Others |
| OAP | Office of the Assistant to the President
| Others |
| OAP | Offset Aimpoint
| Others |
| OAP | Ohio Assembly Plant
| Others |
| OAP | Ohio Association of Parliamentarians
| Others |
| OAP | Old A** Person
| Others |
| OAP | Old Age Pension
| Others |
| OAP | Old Age Pensioner
| Others |
| OAP | Old Age Pensioners
| Others |
| OAP | Old Age People
| Others |
| OAP | Old Age Person
| Others |
| OAP | Old Age Premium
| Others |
| OAP | Old Age Punchbag
| Others |
| OAP | Old Aged Pensioner
| Others |
| OAP | Old Aged Pyton
| Others |
| OAP | Old Ancient Person
| Others |
| OAP | Old and Putrid
| Others |
| OAP | Old Arse People
| Others |
| OAP | Oldest Available P
| Others |
| OAP | Oldtimers Against Progress
| Others |
| OAP | On Account Payment
| Others |
| OAP | On Air Promotions
| Others |
| OAP | On-line Action Plan
| Others |
| OAP | Once A Princess
| Others |
| OAP | One Act Play
| Others |
| OAP | One Ahead Pens
| Others |
| OAP | Online Accelerated Program
| Others |
| OAP | Online Accelerated Programs
| Others |
| OAP | Online And Proud
| Others |
| OAP | Online Artist's Project
| Others |
| OAP | Online Artists Project
| Others |
| OAP | Ontario Automobile Policy
| Others |
| OAP | Open Access Plan
| Others |
| OAP | Open Access Plans
| Others |
| OAP | Open Access Plus
| Others |
| OAP | Open Access Pub
| Others |
| OAP | Open Aid Partnership
| Others |
| OAP | Open Application Process
| Others |
| OAP | Open Architecture Program
| Others |
| OAP | Open Automaton Project
| Others |
| OAP | Operational Advantage Profile
| Others |
| OAP | Opportunities Abroad Program
| Others |
| OAP | Optic Axial Plane
| Others |
| OAP | Optically Activated Pigmented
| Others |
| OAP | Organization Assistance Program
| Others |
| OAP | Organizations Artifacts and Practices
| Others |
| OAP | Original Action Pioneers
| Others |
| OAP | Original Art Plagiarizer
| Others |
| OAP | Osaka Amenity Park
| Others |
| OAP | Oshawa Assembly Plant
| Others |
| OAP | Osps Administrative Processor
| Others |
| OAP | OsteoArthroPathy
| Others |
| OAP | Other art program
| Others |
| OAP | Outcomes Assessment Project
| Others |
| OAP | Outdoor Access Point
| Others |
| OAP | Outdoor Adventure Program
| Others |
| OAP | Outgoing, Active, and Positive
| Others |
| OAP | Outmeal And Porridge
| Others |
| OAP | Outside Awareness Panel
| Others |
| OAP | Outstanding Afternoon Party
| Others |
| OAP | Outstanding Award Program
| Others |
| OAP | Outstandingly Attractive Personality
| Others |
| OAP | Outsystems Application Pack
| Others |
| OAP | Over Age Premium
| Others |
| OAP | Over Anxious Patient
| Others |
| OAP | Overig Academisch Personeel
| Others |
| OAP | Overrunning Alternator Pulley
| Others |
| OAP | Overseas Academic Program
| Others |