TIR

Tir, tir or TIR may refer to:
 * The modern Persian name for the Zoroastrian god Tishtrya
 * Tir (month), of the Iranian calendar
 * Tir (god), of ancient Armenia
 * Tabar, Iran, a village in North Khorasan Province
 * Old English spelling of the Norse god Týr
 * Tir (demon), son of Iblis

Abbreviations

 * Total internal reflection
 * Tigrinya language, ISO 639 code
 * Tirupati Airport, IATA code
 * Translocated intimin receptor, used by E. coli
 * TIR Convention, (Transports Internationaux Routiers, International Road Transport)
 * Toll-Interleukin receptor
 * Total indicator reading in metrology

Other

 * Tir McDohl, in the video game Suikoden
 * INS Tir, various ships of the Indian navy