The T'au (Imperial binomial classification: Tau tau), also spelled Tau in older records and pronounced “TOW,” are a young, humanoid and technologically-advanced intelligent species native to the Eastern Fringes of the Milky Way Galaxy.

They are fighting to expand their interstellar empire and extend a philosophical concept they call the “Greater Good” (Tau'va in the T'au Lexicon) to all the intelligent species of the galaxy.

The T'au claim to be a peaceful species when possible, asking if others will join their cause voluntarily instead of fighting against them.