Obu or OBU may refer to:
Japan-related topics
- 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:
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)
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