| Acronym | Definition |
|---|
| TRRA | Terminal Railroad Association (of St. Louis) |
| TRRA | Three Rivers Rowing Association (Pittsburgh, Pennsylvania) |
| TRRA | Toronto Region Research Alliance (Canada) |
| TRRA | The Ranger Regiment Association |
| TRRA | Taxpayer Refund and Relief Act of 1999 (US) |
| TRRA | Texas River Recreation Association |
| TRRA | Three River Rowing Association (Pittsburgh, Pennsylvania) |
| TRRA | Tax Relief Reconciliation Act of 2003 (US) |
| TRRA | Tilt Rotor Research Aircraft |
| TRRA | training resource requirements analysis |
| TRRA | tumor/tissue-restricted replicative adenovirus |