| Abbreviation | Definition |
|---|---|
| RCY | Rain City Yoga |
| RD | Racketball Deal |
| RD | Ratings Deviation |
| RD | Recreational Device |
| RD | Round Dance |
| RDL | Raleigh Dart League |
| RDL | Real Dodgeball League |
| RDL | Romanian Dead Lift |
| RDP | Relative Damage Points |
| RDS | Réseau des sports |
| RDT | Random Drug Test |
| RDT | Right Defensive Tackle |
| RDW | Real Dirty Wrestler |
| RDWC | Roller Derby World Cup |
| RE24 | Run expectancy based on the 24 base-out states |
| REA | Riot Engine Animation |
| REACH | Reaching Excellent Aerobic Cardiovascular Health |
| REAL | Recreation Enrichment And Learning |
| REB | REBound |
| REBD | Rebound |