OPAD
Office of Policy and Development
OPC
Open GL Performance Characterization (Committee)
OPDR
Office of Policy Development and Research
OPE
Office of Postsecondary Education
OPEC
Organization of Petroleum Exporting Countries
OPHS
Office of Public Health and Science
OPIC
Overseas Private Investment Corporation
OPM
Office of Personnel Management
OPPTS
Office of Prevention, Pesticides, and Toxic Substances
OPR
Office of Professional Responsibility
OPS
Office of Pipeline Safety
OPSEC
Operations Security
OQPSK
offset-quadrature phase-shift keying (communications)
OR
Oregon
de postcode van Oregon
ORACBA
Office of Risk Assessment and Cost-Benefit Analysis
ORB
object request broker (CORBA)
ORD
Office of Rare Diseases
Ore
Oregon
de staat Oregon
ORHP
Office of Rural Health Policy
ORI
Office of Research Integrity
ORLY
Oh really?
SMS/Chat: echt waar?