| TIR | Tabula Imperii Romani 
| Others |
| TIR | Tal Indicator Reading
| Others |
| TIR | Tal Indicator Runout
| Others |
| TIR | tal Internal Reflection
| Others |
| TIR | Tasa Interna de Retorno
| Others |
| TIR | Taxa Interna de Rendibilitat
| Others |
| TIR | Technical Information Release
| Others |
| TIR | Technical Information Report
| Others |
| TIR | Technical Interface Re-certification
| Others |
| TIR | Technical Interface Requirement
| Others |
| TIR | Technologist in Residence
| Others |
| TIR | Telecommande Infra Rouge
| Others |
| TIR | Tenant Improvement Request
| Others |
| TIR | Terminal Imaging Radar
| Others |
| TIR | Test Incident Report
| Others |
| TIR | Test Information Release
| Others |
| TIR | Texas Independence Relay
| Others |
| TIR | The Internet Ramp
| Others |
| TIR | Thermal Infrared
| Energy |
| TIR | This Is Rubbish
| Others |
| TIR | Time Is Right
| Others |
| TIR | Tir Is Roguelike
| Others |
| TIR | Tirupati, India
| Others |
| TIR | Toll or interleukin receptor
| Others |
| TIR | Total Indicated Run
| Others |
| TIR | Total Indicated Runout
| Others |
| TIR | Total Indicator Reading
| Others |
| TIR | Total Indicator Runout
| Others |
| TIR | Total Internal Reflection
| Others |
| TIR | Total Internal Reflector
| Others |
| TIR | Toxic Industrial Radiological
| Others |
| TIR | Traffic Incident Response
| Others |
| TIR | Trailer Interchange Receipt
| Others |
| TIR | Transit International Routier
| Others |
| TIR | Translocated Intimin Receptor
| Others |
| TIR | Translocated intimin receptors
| Others |
| TIR | Transport International Routier
| Others |
| TIR | Transport Internationale Routiers
| Others |
| TIR | Transportation and Infrastructure Renewal
| Others |
| TIR | Transports Internationaux Routiers
| Others |
| TIR | Trapped In Reality
| Others |
| TIR | Traumatic Incident Reduction
| Others |
| TIR | Trofeo Italiano Rally
| Others |
| TIR | Trucker's Interchange Receipt
| Others |
| TIR | True Image Recovery
| Others |
| TIR | True Image Restore
| Others |
| TIR | Trust In Rock
| Others |
| TIR | Tubular Internal Re
| Others |
| TIR | Tucson International Raceway
| Others |