Ubu may refer to:
- Ubu Repertory Theater
- Ubu, Nepal
- Ubu or Uub, a character in Dragon Ball media
- Ubu Roi (King Ubu), a French play by Alfred Jarry, along with subsequent plays Ubu Cocu (Ubu Cuckolded) and Ubu Enchaîné (Ubu Enchained) featured "Ubu" as the main character
- Ubu Roi, mascot of Ubu Productions
- Pere Ubu, an experimental rock band from Cleveland, Ohio
- Ubu Films, a Sydney-based Australian underground film-makers' cooperative that existed from 1965 to ca. 1972
- Unbiunium (Ubu), an unsynthesized chemical element with an atomic number of 121.
- Ubu Imperator, a 1923 painting by Max Ernst
- "Ubu", a song by Blurt on their album Blurt in Berlin
- ISO 639 code for the Trans–New Guinea language, Umbu-Ungu
UBU may stand for:
- University of Bradford Union, a student union in the United Kingdom
- University of Bristol Union, a student union in the United Kingdom
- University of Burgos, a public university in the Spanish city of Burgos
- Ubu Productions (trademarked UBU), a U.S. television production company
- Burundi Workers' Party (Kirundi: Umugambwe wa'Bakozi Uburundi), a clandestine Marxist political party in Burundi