| OA |
Office of Administration |
| OAAG |
Office of the Associate Attorney General |
| OAC |
Office of Antiboycott Compliance |
| OACU |
Office of Animal Care and Use |
| OAG |
Office of the Attorney General |
| OAHP |
Office of Affordable Housing Preservation |
| OAIT |
Office of American Indian Trust (Archive) |
| OALJ |
Office of Administrative Law Judges |
| 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 |
| OASAM |
Office of the Assistant Secretary for Administration and Management |
| OASDI |
Old-Age and Survivors Insurance and Disability Insurance |
| OAT |
Office for the Advancement of Telehealth |
| OBA |
Office of Biotechnology Activities |
| OBEMLA |
Office of Bilingual Education and Minority Languages Affairs (changed to OELA) |
| OBI |
Office of Business Innovations (defunct) |
| OBL |
Office of Business Liaison |
| OBO |
Bureau of Overseas Building Operations |
| OBPA |
Office of Budget and Program Analysis |
| OBSSR |
Office of Behavioral and Social Sciences Research |
| OCC |
Comptroller of the Currency |
| OCDETF |
Organized Crime Drug Enforcement Task Force |
| OCE |
Office of the Chief Economist | Office of Congressional Ethics |
| OCFT |
Office of Child Labor, Forced Labor, and Human Trafficking |
| OCIA |
Office of Congressional and Intergovernmental Affairs |
| OCIO |
Office of the Chief Information Officer |
| OCR |
Office for Civil Rights (Dept. of Education) |
| OCRM |
Ocean and Coastal Resource Management |
| OCRS |
Organized Crime and Racketeering Section |
| OCRWM |
Office of Civilian Radioactive Waste Management |
| OCS |
Office of Coast Survey | Office of Community Services |
| OCSC |
Office of Citizen Services and Communications (changed to OCSIT) |
| OCSE |
Office of Child Support Enforcement |
| OCSIT |
Office of Citizen Services and Innovative Technologies |
| OCSPP |
Office of Chemical Safety and Pollution Prevention |
| OCSQ |
Office of Clinical Standards and Quality |
| OD |
Office on Disability |
| ODAG |
Office of the Deputy Attorney General |
| ODEP |
Office of Disability Employment Policy |
| ODGMO |
Office of Departmental Grants Management and Oversight |
| ODLS |
Online Detainee Locator System |
| ODNI |
Office of the Director of National Intelligence |
| ODP |
Office for Domestic Preparedness (merged into FEMA) | Office of Disease Prevention |
| ODPHP |
Office of Disease Prevention and Health Promotion |
| ODR |
Office of Dispute Resolution |
| OE |
Office of Electricity Delivery and Energy Reliability |
| OEA |
Office of Economic Adjustment |
| OECA |
Office of Enforcement and Compliance Assurance |
| OECD |
Organization for Economic Cooperation and Development |
| OEGT |
Office of Electronic Government and Technology (changed to egov) |
| OEI |
Office of Environmental Information |
| OELA |
Office of English Language Acquisition |
| OEMM |
Offshore Energy and Minerals Management |
| OEO |
Office of Enforcement Operations |
| OERI |
Office of Educational Research and Improvement (archive; see IES) |
| OERR |
Office of Emergency Response and Recovery |
| OES |
Bureau of Oceans and International Environmental and Scientific Affairs |
| OESE |
Office of Elementary and Secondary Education |
| OET |
Office of Educational Technology |
| OFA |
Office of Family Assistance |
| OFAC |
Office of Foreign Assets Control |
| OFAM |
Office of Financial and Administrative Management |
| OFCCP |
Office of Federal Contract Compliance Programs |
| OFCM |
Office of the Federal Coordinator for Meteorology |
| OFDT |
Office of the Federal Detention Trustee |
| OFHEO |
Office of Federal Housing Enterprise Oversight (merged into FHFA) |
| OFM |
Office of Financial Management |
| OFR |
Office of the Federal Register |
| OGAC |
Office of the U.S. Global AIDS Coordinator |
| OGC |
White House Office of Global Communications |
| OGE |
Office of Government Ethics |
| OGHA |
Office of Global Health Affairs |
| OGIS |
Office of Government Information Services (.pdf) |
| OGP |
Office of Governmentwide Policy |
| OGWDW |
Office of Ground Water and Drinking Water |
| OHAP |
Office of HIV/AIDS Policy |
| OHASIS |
Office of Health and Safety Information System |
| OHCHR |
Office of the UN High Commissioner for Human Rights |
| OHHLHC |
Office of Healthy Homes and Lead Hazard Control |
| OHPI |
Office of Highway Policy Information |
| OHRP |
Office for Human Research Protections |
| OHS |
Office of Head Start |
| OHTA |
Office of Historical Trust Accounting |
| OIA |
Office of Insular Affairs | Office of International Affairs |
| OIE |
World Organization for Animal Health |
| OIEP |
Office of Indian Education Programs (changed to BIE) |
| OII |
Office of Innovation and Improvement |
| OIIA |
Office of Intergovernmental and Interagency Affairs (archive) |
| OIG |
Office of the Inspector General (DOJ) | (USDA) |
| OIP |
Office of Information and Privacy |
| OIPL |
Office of Intergovernmental and Public Liaison |
| OIPR |
Office of Intelligence Policy and Review (changed to Office of Intelligence) |
| OIR |
Office of International Relations |
| OIRA |
Office of Information and Regulatory Affairs |
| OIT |
Office of International Trade |
| OITA |
Office of International and Tribal Affairs |
| OJC |
Office of Job Corps |
| OJJDP |
Office of Juvenile Justice and Delinquency Prevention |
| OJP |
Office of Justice Programs |
| OLA |
Office of Legislative Affairs |
| OLAW |
Office of Laboratory Animal Welfare |
| OLC |
Office of Legal Counsel |
| OLMS |
Office of Labor Management Standards |
| OLP |
Office of Legal Policy |
| OLR |
Office of Labor Relations |
| OMAO |
Office of Marine and Aviation Operations |
| OMAR |
Office of Medical Applications of Research |
| OMB |
Office of Management and Budget |
| OME |
Office of Migrant Education |
| OMEI |
Office of Minority Economic Impact |
| OMH |
Office of Minority Health |
| OMHAR |
Office of Multifamily Housing Assistance Restructuring (replaced by OAHP) |
| OMHD |
Office of Minority Health and Health Disparities |
| OMHR |
Office of Minority Health and Research |
| OMM |
Offshore Minerals Management Program |
| ONAP |
Office of National AIDS Policy | Office of Native American Programs |
| ONC |
Office of the National Coordinator for Health Information Technology |
| ONCIX |
Office of the National Counterintelligence Executive |
| ONDCP |
Office of National Drug Control Policy |
| ONHIR |
Office of Navajo and Hopi Indian Relocation |
| ONPE |
Office of Non-Public Education |
| ONRR |
Office of Natural Resources Revenue |
| ONS |
Office of Nursing Services |
| OOHLHC |
Office of Healthy Homes and Lead Hazard Control |
| OPA |
Office of Population Affairs |
| OPAD |
Office of Policy and Development |
| OPC |
Office of the Police Corps (defunct; see Wayback Machine) |
| OPCL |
Office of Privacy and Civil Liberties |
| OPDAT |
Office of Overseas Prosecutorial Development, Assistance and Training |
| OPDR |
Office of Policy Development and Research |
| OPE |
Office of Postsecondary Education | Office of Public Engagement |
| OPEC |
Organization of Petroleum Exporting Countries |
| OPEPD |
Office of Planning, Evaluation and Policy Development |
| OPHS |
Office of Public Health and Science |
| OPIC |
Overseas Private Investment Corporation |
| OPL |
Office of Policy and Legislation |
| OPL-IGA |
Office of Public Liaison & Intergovernmental Affairs (changed to OPE) |
| OPM |
Office of Personnel Management |
| OPPTS |
Office of Prevention, Pesticides, and Toxic Substances (changed to OCSPP) |
| OPR |
Office of Professional Responsibility |
| OPS |
Office of Pipeline Safety |
| OPSEC |
Operations Security |
| OPTF |
Obscenity Prosecution Task Force |
| ORA |
Office of Regulatory Affairs | Office of Research and Applications (changed to STAR) |
| 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 |
| ORISE |
Oak Ridge Institute for Science and Education |
| ORMH |
Office of Research on Minority Health (changed to OMHR) |
| ORNL |
Oak Ridge National Laboratory |
| ORR |
Office of Refugee Resettlement | Office of Response and Restoration |
| ORWH |
Office of Research on Women’s Health |
| OSAC |
Overseas Security Advisory Council |
| OSBP |
Office of Small Business Programs (see OSDBU) |
| OSC |
Office of Special Counsel | Open Source Center |
| OSCE |
Office of Child Support Enforcement |
| OSD |
Office of the Secretary of Defense |
| OSDBU |
Office of Small and Disadvantaged Business Utilization |
| OSDFS |
Office of Safe and Drug-Free Schools |
| OSEC |
Office of the Secretary (Dept. of Labor) |
| OSEP |
Office of Special Education Programs |
| OSERS |
Office of Special Education and Rehabilitative Services |
| OSF |
Office of Space Flight (changed to Office of Space Operations) |
| OSFAP |
Office of Student Financial Assistance Programs (changed to FSA) |
| OSG |
Office of the Solicitor General | Office of the Surgeon General |
| OSHA |
Occupational Safety and Health Administration |
| OSHRC |
Occupational Safety and Health Review Commission |
| OSI |
Office of Special Investigations |
| OSM |
Office of Surface Mining Reclamation and Enforcment | Office of Spectrum Management |
| OSO |
Office of Space Operations |
| OSS |
Office of Strategic Services |
| OST |
Office of the Special Trustee for American Indians |
| OSTI |
Office of Scientific and Technical Information |
| OSTP |
Office of Science and Technology Policy |
| OSWER |
Office of Solid Waste and Emergency Response |
| OTA |
Office of Technology Assessment |
| OTIA |
Office of Telecommunications and Information Applications |
| OTJ |
Office of Tribal Justice |
| OTLA |
Office of Trade and Labor Affairs |
| OTP |
Office of Technology Policy (unable to verify 4/09; see Wayback Machine) |
| OTS |
Office of Thrift Supervision |
| OTT |
Office of Transportation Technologies (changed to FreedomCAR) |
| OVAE |
Office of Vocational and Adult Education |
| OVBD |
Office of Veterans Business Development |
| OVC |
Office for Victims of Crime |
| OVP |
Office of the Vice President |
| OVW |
Office on Violence Against Women |
| OWBO |
Office of Women’s Business Ownership |
| OWCP |
Office of Workers’ Compensation Programs |
| OWH |
Office on Women’s Health |
| OWOW |
Office of Wetlands, Oceans and Watersheds |
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