In language and linguistics:

Tu is the 2nd-person singular subject pronoun in Spanish, Italian, Lithuanian, Portuguese, French, Irish, Latvian, Romanian, Latin, and Hindustani. See:

  • Personal pronoun, personal pronouns such as 'tu' in these and other languages
  • T–V distinction, the use in some languages of a different personal pronoun for formality or social distance, such as tu/vos in Latin, tu/vouz in French and the majestic plural in English

Tu may also refer to:

  • Tuberculin Units, a measure of strength of tuberculin
  • Tren Urbano, the metro system used in San Juan, Puerto Rico
  • Tu Hundred, a district of Västmanland in Sweden
  • Universal Time, "Tempus Universalis"
  • TU (Time Unit). "Time Unit in Wireless LAN network standard"
  • Tū (Tūmatauenga), a supernatural being in Māori mythology
  • Tu people, the Monguor people of the People's Republic of China
    • Tu language
  • Tú (band), a Canadian pop music duo in the late-1980s
  • TU (band), an American band
  • "Tú" (song), a song by Shakira from her album Donde Estan Los Ladrones?
  • Tu, a Chinese family name
  • Tu, a Croatian film
  • Tu (cake), a type of Tibetan cake

In companies and organizations:

  • TU (union), the international union for T-Mobile workers
  • Tupolev, a Russian aerospace and defence company
  • Tunisair IATA code
  • Toimihenkilöunioni, Union of Salaried Employees, a Finnish trade union
  • TU Media, a Digital Multimedia Broadcasting mobile companies in Korea
  • Transunion, a consumer credit reporting agency
  • Tu, the own brand clothing range of Sainsbury's supermarkets in the United Kingdom

In universities:

  • Tartu University
  • Taylor University
  • Any Technische Universität, i.e. university of technology in German-speaking countries
  • Temple University
  • Tezpur University
  • Thapar University
  • Thammasat University
  • Tooling University
  • Touro University California
  • Touro University Nevada
  • Towson University
  • Tribhuvan University
  • Trinity University
  • Tulane University
  • University of Tulsa
  • t.u., a derisive reference to the University of Texas at Austin by students and supporters of in-state rival Texas A&M University
  • TÜ, the University of Tartu National University of Estonia