Oga

Oga or OGA may refer to:

Places

 * Oga, Akita, Tōhoku, Japan
 * Oga Peninsula, Japan
 * Oga, a frazione of Valdisotto, Italy

People

 * Oga Atsushi, a Japanese sumo wrestler
 * My Oga at the top, Nigerian Pidgin English term for "boss" or "leader"
 * Aragami Oga, a virtual YouTuber affiliated with Hololive Production

As an acronym and initialism

 * Office Genuine Advantage in Microsoft Office
 * Oil and Gas Authority, regulator of oil and gas operations in the United Kingdom
 * Old Gaffers Association
 * Open Genealogy Alliance
 * OGA, the IATA airport code for Searle Field airport, Ogallala, Nebraska
 * Other government agency, an initialism used in certain United States military contexts to refer to the Central Intelligence Agency or other governmental organizations embedded with military units

Other uses

 * Oga (Gojoseon), a political structure in the ancient Asian kingdoms of Gojoseon and Buyeo
 * .oga, an Ogg file containing audio
 * Protein O-GlcNAcase, an enzyme that removes the post-translational modification O-GlcNAc