| Acronym | Meaning |
 | OCS | Office Of Community Services |
| OCSE | Office Of Child Support Enforcement |
| ODEP | Office Of Disability Employment Policy |
| ODP | Office Of Disease Prevention |
| OECA | Office Of Enforcement And Compliance Assurance |
| OECD | Organization For Economic Cooperation And Development |
| OEGT | Office Of Electronic Government And Technology |
| OELA | Office Of English Language Acquisition |
| OERI | Office Of Educational Research And Improvement (replaced By IES) |
| OES | Bureau Of Oceans And International Environmental And Scientific Affairs |
| OESE | Office Of Elementary And Secondary Education |
| OFA | Office Of Family Assistance |
| OFAC | Office Of Foreign Assets Control |
| OFCCP | Office Of Federal Contract Compliance Programs |
| OFHEO | Office Of Federal Housing Enterprise Oversight |
| OFM | Office Of Financial Management |
| OFR | Office Of The Federal Register |
| OGE | Office Of Government Ethics |
| OGP | Office Of Governmentwide Policy |
| OGWDW | Office Of Ground Water And Drinking Water |
| OHASIS | Office Of Health And Safety Information System |
| OHRP | Office For Human Research Protections |
| OIG | Office Of The Inspector General (USDA) |
| OIIA | Office Of Intergovernmental And Interagency Affairs |
| OJJDP | Office Of Juvenile Justice And Delinquency Prevention |
| OJP | Office Of Justice Programs |
| OLAW | Office Of Laboratory Animal Welfare |
| OLMS | Office Of Labor Management Standards |
| OMAO | Office Of Marine And Aviation Operations |
| OMAR | Office Of Medical Applications Of Research |
| OMB | Office Of Management And Budget |
| OMH | Office Of Minority Health |
| OMHAR | Office Of Multifamily Housing Assistance Restructuring |
| OMM | Offshore Minerals Management Program |
| ONDCP | Office Of National Drug Control Policy |
| ONR | Office Of Naval Research |
| OPA | Office Of Population Affairs |
| 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 |
| ORA | Office Of Research And Applications |
| ORACBA | Office Of Risk Assessment And Cost-Benefit Analysis |
| ORD | Office Of Rare Diseases |
| ORHP | Office Of Rural Health Policy |
| ORI | Office Of Research Integrity |
| ORMH | Office Of Research On Minority Health |
| ORNL | Oak Ridge National Laboratory |
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