| Abbreviation | Definition |
|---|---|
| R | Reject |
| R | Report |
| R | Rule |
| R&R | Rest and Relaxation |
| R/UOP | Rural/Underserved Opportunities Program |
| RA | Recent Action |
| RA | Resident Authority |
| RAA | Registrar Accreditation Agreement |
| RAC | Recovery Audit Contractor |
| RAC | Regional Advisory Committee |
| RAC | Roadless Area Conservation |
| RACHEL | Remote Access Chemical Hazards Electronic Library |
| RACO | Reimbursable Agreements Coordination Office |
| RADIUS | Research And Development In The United States |
| RADM | Rear Admiral upper half |
| RAFSA | Restoring American Financial Stability Act |
| RAISE | Rebuilding American Infrastructure with Sustainability and Equity |
| RAMP | Records and Archives Management Program |
| RAO | Revenue Accounting Office |
| RAP | Radiological Assistance Program |