Tau (Warhammer 40,000), an alien race from the fictional Warhammer 40,000 universe.

Tau'ri, the name for humans of Earth, used in the Stargate fictional universe.

Thermal Assist Unit, part of a PowerPC.

Tau is the standard astronomical abbreviation for the constellation Taurus.

Tau lepton, a fundamental particle.

Tau (protein), a biochemical protein associated with microtubules.

An acronym for Tel Aviv University - Tel Aviv University

Tau is the 19th letter of the Greek alphabet. Tau may also refer to:

Tau, Samoa (Taʻū), an island in the Manuʻa Island Group of American Samoa.

The Cross of Tau, a Christian symbol so called due to its resemblance to the letter Tau.

Tau (mythology), an evil spirit in Guaraní mythology.

Jimmy Tau, South African football (soccer) player

Tau (theorem prover), an automated theorem prover for first-order predicate logic with equality.

TAU mission, a proposal to send a space probe to a thousand astronomical units from the Earth.

Tau, Norway, a small town in western Norway.

Tău, two villages in Romania.

Tau test in statistics (tau-a, tau-b and tau-c tests or Kendall tau rank correlation coefficient).

Tau in circadian biology is a mutation in the Casein kinase 1 epsilon protein, which regulates phosphorylation of the clock protein PER.

Telelogic TAU, a UML and SysML modelling tool.