| TIRA | Tacoma Inboard Racing Association 
| Others |
| TIRA | Tanzania Insurance Regulatory Authority
| Others |
| TIRA | Task Inventory and Risk Assessments
| Others |
| TIRA | Textual Information Retrieval And Analysis
| Others |
| TIRA | The International Ribes Association
| Others |
| TIRA | Thermospheric And Ionospheric Research And Applications
| Others |
| TIRA | Traditional Individual Retirement Account
| Others |
| TIRA | Traumatic Incident Reduction Association
| Others |
| TIRA | Trofeo Italiano Rally Asfalto
| Others |