Tir, tir or TIR may mean:
- The French term for Schützenfest, a target-shooting competition
- Tir (month), the fourth month (the first month of summer) in the Iranian calendar
- Tir, Iran, a village in North Khorasan Province, Iran
- Occasional spelling of the Old Norse theonym Tyr
- A woman thrall in Old Norse society
- Abbreviations
- Total Internal Reflection
- Tigrinya language ISO 639 code
- Tirupati Airport, the IATA airport code
- Traumatic Incident Reduction, a form of psychotherapy
- The TIR Treaty of road transportation (Transports Internationaux Routiers, International Road Transport)
- Toll/Interleukin-1 receptor, the cytoplasmic domain of TLR-4
- Total indicated runout, a measure of roundness or concentricity in the production of machined parts
- Total indicator reading, a more general extrapolation of total indicated runout, applicable to other areas of metrology
- Total Immersion Racing, a 2002 racing videogame.
- Other
- Tir McDohl, the name given to the protagonist in the Japanese novelization and radio drama adaptation of the video game Suikoden
- INS Tir, various ships of the Indian navy
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