| Abbreviation | Definition |
|---|---|
| RICHS | Rural Information Center Health Service |
| RIF | Reduction In Force |
| RIF | reduction-in-force |
| RIHSC | Research Involving Human Subjects Committee |
| RIHSC | Research Involving Human Subjects Committee (FDA) |
| RIM | Reference Information Model |
| RIM | reference information model (HL7) |
| RIMS | Regulatory Information Management Staff |
| RIPA | radioimunoprecipitation assay |
| RIS | Regulatory Information Specialist |
| RIS | Retroviral Immunology Section |
| RIS(CBER) | Retroviral Immunology Section (CBER) |
| RIT | relocation income tax |
| RKW1 | Rockwall Building I |
| RKW2 | Rockwall Building II |
| RL | Regulatory Letter |
| RL | regulatory letter (FDA post-audit letter) |
| RLD | Reference Listed Drug |
| RM | Raw Material |
| RMAB(CDRH) | Risk Management and Analysis Branch (CDRH) |