English abbreviations from oa to oah
- OA (Occupational Analysis)
- OAA (OxAloAcetate)
- OAB (Ordem dos Advogados do Brasil (Brazilian Law Board))
- OAC (Organization for African Community)
- OACES (Online Academic Communication Environment And Support)
- OACW (Ohio Athletic Conference Wrestling)
- OACWC (Ohio Athletic Conference Wrestling Championship)
- OAD (Original Air Date)
- OADM (Optical Add-Drop Multiplexer)
- OADR (Originating Agency Determination Required)
- OAE (Operational Area Evaluation)
- OAF (Object Activation Framework)
- OAFC (Ohio Association of Free Clinics)
- OAFME (Office of the Armed Forces Medical Examiner)
- OAG (Open Applications Group)
- OAH (Omnipotent Author Hammerspace)