Oga or OGA may refer to:
- Oga, Akita, Japan
- Oga Peninsula
- Oga, a frazione of Valdisotto, Italy
- Oga Atsushi, a Japanese sumo wrestler
- Other government agency, a euphemism for the American Central Intelligence Agency
- Office Genuine Advantage in Microsoft Office
- Ogg, An Ogg file containing audio
- Open Genealogy Alliance
- Oregon Golf Association
- OGA, the IATA airport code for Searle Field airport, Ogallala, Nebraska
- Protein O-GlcNAcase, an enzyme
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