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 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 See also Olga (disambiguation) de:OGA