| Abbreviation | Definition |
|---|---|
| RFK | Robert F. Kennedy Stadium, Washington, D.C. |
| RFL | Rebel Football League |
| RFL | Robot Fighting League |
| RFL | Robot Football League |
| RFL | Rossbrook Football League |
| RFR | Rutgers Formula Racing |
| RFS | Racing Four Stroke |
| RFT | Racing For Teens |
| RFU | Rugby Football Union |
| RG | Random Guess |
| RG | Rat Games |
| RG | Right Guard |
| RG | Rochester Gamers |
| RGIII | Robert Griffin III |
| RGM | Robby Gordon Motorsports |
| RGN | Racing Games Network |
| RGN | Recoil Gaming Network |
| RGN | RushGaming.net |
| RGS | Rickis Golden Star |
| RGZ | Redwall Gaming Zone |