Tav or TAV may refer to:
- Tav (letter) (also written taf or taw), the last letter of many Semitic abjads
- Tav (number) (also written taf or taw), the denotation of a specific transfinite number
- Tav Falco, an American entertainer
- TAV Airports Holding (Tepe Akfen Ventures), a Turkish airport operator
- TAV-8B, the two-seat version of the McDonnell Douglas AV-8B Harrier II aircraft
- TAV RJ-SP, the Brazilian Rio–São Paulo high-speed rail system
- The Artists Village, an experimental arts group in Singapore
- Treno Alta Velocita, the SPE for the planning and construction of the Italian high-speed rail network
- The Advanced Visualizer, a 3D graphics software package