| Abbreviation | Definition |
|---|---|
| RLL | Reference and Loan Library |
| RLQ | Rural Libraries Queensland |
| RLRT | Rural Libraries Round Table |
| RLS | Regional Library System |
| RLSD | Research and Library Services Division |
| RLUK | Research Libraries of the United Kingdom |
| RLWPL | Robert L. Williams Public Library (Durant, OK) |
| RMBL | Rasey Memorial Branch Library |
| RMBL | Reid Memorial Branch Library |
| RMPL | Rice Membrane Protein Library |
| RMPL | Rocky Mountain Philatelic Library |
| RMRL | Roja Muthiah Research Library |
| RND | Reeks Nederlandse Dialectatlassen |
| ROA | Round Of Applause |
| ROA | Rutgers Optimality Archive |
| ROHO | Regional Oral History Office |
| ROL | Rapid Optimization Library |
| ROL | Report Object Library |
| ROPES | Repeat Opinion Post Example Summary |
| ROTHMC | Roll Of Thunder, Hear My Cry |