| Rank | Abbreviation | Meaning |
|---|
| ***** | TRRC | Tertre Rouge Racing Cars
| |
| ***** | TRRC | Transportable Recompression Rescue Chamber
| |
| ***** | TRRC | TAC Repair and Rehabilitation Committee
| |
| **** | TRRC | Taconic Road Runners Club
| |
| **** | TRRC | TRADOC Requirements Review Council (US Army)
| |
| **** | TRRC | Time Resolved Ray Crystallography
| |
| **** | TRRC | Tilford and Rushmoor Riding Club
| |
| **** | TRRC | Therapeutic Recreational Riding Center
| |
| **** | TRRC | Tibetan Refugee Reception Centre
| |
| **** | TRRC | Two Rivers Regional Council
| |
| *** | TRRC | Three Rivers Running Company
| |
| *** | TRRC | Tsunami Relief and Rehabilitation Committee
| |
| *** | TRRC | Toronto Renaissance and Reformation Colloquium
| |
| *** | TRRC | Thames Regional Rowing Council
| |
| *** | TRRC | The Refugee Reception Center (displaced persons shelter)
| |
| *** | TRRC | Trial Registry and Repository Center
| |
| *** | TRRC | The Romance Readers Connection
| |
| *** | TRRC | Turtle Ridge Rock Challenge (Michigan 4WD event)
| |
| *** | TRRC | Temperate Rice Research Consortium
| |
| *** | TRRC | Thames Regional Rowing Council (est. 1903)
| |
| ** | TRRC | Tongue River Railroad Company
| |
| ** | TRRC | Twin Rivers Research Center
| |
| ** | TRRC | Tsunami Relief Rehabilitation Coordination
| |
| ** | TRRC | Teslin Renewable Resource Council
| |
| ** | TRRC | Toledo Road Runners Club
| |