Tu or TU may stand for:

• Tu Matauenga;
• Tu (ethnic group);
• Tu (band);
• Tu, an abbreviation for the Russian Tupolev design bureau; or
• Tu Hundred - a district of Westmannia in Sweden
• the IATA code for Tunisair
• universities:
  • any Technische Universität, i.e. university of technology in German-speaking countries
  • University of Tulsa
  • Towson University
  • As t.u. (in lower case), this is used as a derogatory reference to the University of Texas at Austin by students and supporters of its arch-rival, Texas A&M University.

• Tu is an informal second-person pronoun in several languages. For more information on formal and informal pronouns, see T-V distinction.