Oba or OBA may refer to:
- Oba (king), a Bini and Yoruba title for certain royal rulers
 - Oba (orisha), a spirit who is prominent in various Traditional African religions and Afro-American religions
 - Ōba, a Japanese surname
 - Oba: The Last Samurai, a 2011 Japanese film
 - Oba Chandler (1946–2011), an American murderer executed in 2011
 
OBA
- Office Business Applications, software which uses applications within the Microsoft Office system
 - Oklahoma Bible Academy, a Christian secondary institution in Enid, Oklahoma, U.S.
 - Oklahoma Bankers Association, a trade association in Oklahoma, U.S.
 - Oklahoma Bar Association, the state bar (legal association) of Oklahoma, U.S.
 - On base average, a baseball statistic
 - One Bermuda Alliance, a Bermuda political party
 - Online Behavioral Advertising, a range of technologies and techniques used by online website publishers and advertisers
 - Only Boys Aloud, Welsh male voice choir
 - Ontario Bar Association
 - Openbare Bibliotheek Amsterdam, the public library of Amsterdam
 - Optical Brightening Agent, a type of dye used in fabric and paper
 - Out-of-band agreement, in communications
 - Output-based aid, a type of aid to support the delivery of public services in developing countries
 - Oxygen Breathing Apparatus, an oxygen supply system used by the US Navy for firefighting
 
Places
- Oba, Ontario a remote hamlet in Ontario, Canada
 - Oba Island, in Vanuatu
 - Oba-Igbomina, a town in Nigeria
 - Oba, Anambra, a town in Anambra State, Nigeria
 - Oba River, a river in Nigeria
 - Orange Beach, Alabama
 - Oba, Indonesia - that part of the administered area of the town of Tidore lying on Halmahera Island
 - Oba Market, Historical market at Ring Road in Edo State, Nigeria
 
See also
- Ago-Oba, an electoral ward in the city of Abeokuta, Ogun State, Nigeria
 - Obba (disambiguation)
 
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