Tav or TAV may refer to:
Math, science and technology Tav (number), in set theory the collection of all cardinal numbers The Advanced Visualizer, a 3D graphics software package Ti-6Al-4V, a titanium alloy containing aluminum and vanadium Tire Assault Vehicle, a small teleoperated vehicle used to test Space Shuttle tires Tomato aspermy virus, a plant virus Tropical Atlantic Variability, in meteorology
Nickname Tav Falco (born 1945), American musical performer, performance artist, actor, filmmaker and photographer Octavio M. Salati ("Tav") (1914–2001), American engineer, academic and educator
Transportation TAV, IATA airport code for Tau Airport, American Samoa TAV, airline code for Compañía de Servicios Aéreos Tavisa TAV-8B, the two-seat version of the McDonnell Douglas AV-8B Harrier II aircraft TAV Airports Holding (Tepe Akfen Ventures), a Turkish airport operator Treno Alta Velocità, the a special-purpose entity working name for the Italian high-speed rail network TAV RJ-SP, the far future possible Brazilian Rio–São Paulo high-speed rail system
Other uses tav, ISO 639-3 code for the Tatuyo language of Colombia Tav (letter), the last letter of many Semitic abjads The Artists Village, an experimental arts group in Singapore Toon-A-Vision channel