| Abbreviation | Definition |
|---|---|
| TRGL | The Riverside Group Ltd |
| TRH | The Riddle House |
| TRHI | Tradewinds Rattan and Handicraft Inc |
| TRHS | Terry Reilly Health Services |
| TRI | Todd Rundgren Interactive |
| TRI | Transducer Research Incorporated |
| TRIC | Trench Replacement And Inspection Company |
| TRL | Telstra Research Laboratories |
| TRL | Tokyo Research Laboratory |
| TRL | Touchstone Research Laboratory |
| TRL | Transport Research Laboratory |
| TRL | Tube Research Labs |
| TRM | Total Resource Management |
| TRMC | The Rental Management Company |
| TRO | The Rights Organization |
| TRO | The Ritchie Organization |
| TRP | Truck Replacement Parts, Inc. |
| TRR | Track Roller Rebuilders of Syracuse |
| TRRS | The Red Rose Society |
| TRS | Tandy Radio Shack |