O
Over
SMS/Chat: over
OA
Office of Administration
OAAG
Office of the Associate Attorney General
OAC
Office of Antiboycott Compliance
OACU
Office of Animal Care and Use
OADM
optical add-drop multiplexer
OAG
Office of the Attorney General
OAG
Office of the Auditor General [of Canada]
OAHP
Office of Affordable Housing Preservation
OAIT
Office of American Indian Trust
OALJ
Office of Administrative Law Judges
OAM
operations, administration, and maintenance
OAM&P
operations, administration, maintenance, and provisioning
OAP
Old Age Pensioner
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OAQPS
Office of Air Quality Planning and Standards
OAR
Office of AIDS Research | Office of Oceanic and Atmospheric Research
OARM
Office of Attorney Recruitment and Management
OAS
Office of Applied Studies | Organization of American States
OAS
Old Age Security
OASDI
Old-Age and Survivors Insurance and Disability Insurance
OAT
Office for the Advancement of Telehealth