Thu and variations may refer to:
Education Tsinghua University, China Tunghai University, Taiwan
People and characters Thu (surname), romanisation of Su, and people so named Thû (or Sauron), antagonist of J.R.R. Tolkien's legendarium Thư, Vietnamese romanization of Shu (surname) (舒) Thu, a fictional dog in The Claidi Journals by Tanith Lee
Places Thu, Palpa, a village in Nepal Pituffik Space Base (IATA:THU)
Other uses Thursday (Thu or THU), a day of the week Thu (pronoun) (also spelt Þu), in Old English Thu., abbreviation for the orchid genus Thunia