Thu and variations may refer to:

  • Thursday
  • Thu (surname), the Gan romanization of the Chinese surname Su
  • Thu (pronoun) or Þu, an Old English pronoun
  • Thû, an early name for Sauron in J.R.R. Tolkien's works
  • Thu, Palpa, a village development committee in Nepal
  • Thu., abbreviation for the orchid genus Thunia
  • Thu, a dog belonging to the Claidi and Argul in The Claidi Journals by Tanith Lee
  • Thu, a nation on the fictional planet Urras in the novel The Dispossessed by Ursula K. Le Guin
  • Tsinghua University in China
  • Thule Air Base (IATA airport code)