Obu or OBU may refer to:

  • Obu Toramasa (1504–1565), Japanese samurai
  • Ōbu, a city in the Aichi prefecture
  • Ōbu Station, a railway station in the city of Ōbu

Educational institutions

  • Oxford Brookes University, Oxford, England
  • United States:
  • Oklahoma Baptist University
  • Ouachita Baptist University

Finance

  • Offshore banking, also known as Offshore Banking Unit

Trade unionism

  • One Big Union (Canada)
  • One Big Union (concept)
  • Operative Builders' Union, early British union federation

Other uses

  • obu, ISO 639-3 code for Obulom language of Nigeria
  • On-Board Unit for implementing Italian toll-highway Telepass
  • Open Bitstream Unit in the AOMedia Video 1 (AV1)