| Abbreviation | Definition |
|---|---|
| TRD | Toyota Racing Development |
| TRD | Toyota Racing Division |
| TRE | Touring Road Event |
| TRE | Transact Race Engineering |
| TRFC | Tranmere Rovers Football Club |
| TRG | Team Rocket Garrison |
| TRG | That Rollercoaster Game |
| TRGA | Three Rivers Golf Association |
| TRH | Trail Riders of Houston |
| TRIBE | Trail Riding In Barren Environments |
| TRL | Three Rivers League |
| TRLL | Toms River Little League |
| TRNZ | Touch Rugby New Zealand |
| TROT | Tarheel Riders On The Trails |
| TROT | Therapeutic Riding Of Tucson |
| TROT | Trail Riding Of Today |
| TRR | Team Random Respawn |
| TRS | Total Ripper Series |
| TRU | Tough, Ruthless, Unity |
| TRW | The Right Way Ski Club |