| Abbreviation | Definition |
|---|---|
| ORBI | Ohio River Border Initiative |
| ORC | Ontario Racing Commission |
| ORCGP | Ohio Research Commercialization Grant Program |
| ORDG | Older Refugee Discretionary Grant |
| ORDP | Ohio Rural Development Partnership |
| ORGA | Oconee River Greenway Authority |
| ORGN | Oregon Real-time GPS Network |
| ORH | Office of Rural Health |
| ORPAL | Office of Recruitment, Personnel Assessment, and Licensing |
| ORSC | Oregon Residential Specialty Code |
| ORST | Ontario Retail Sales Tax (replaced by HST 2010-07-01) |
| ORWA | Oklahoma Rural Water Association |
| OSAB | Open Space Advisory Board |
| OSAE | Ohio Society of Association Executives |
| OSB | Office of the Superintendent of Bankruptcies |
| OSB | Ontario Student Assistance Program |
| OSBA | Office of Small Business Assistance |
| OSC | Office of the State Comptroller |
| OSCAR | Ohio State Capabilities Assessment for Readiness |
| OSD | Operational Services Division |