Koji Ota (太田 幸司, Ōta Kōji, born January 23, 1952 in Misawa, Aomori, Japan) is a Japanese former professional baseball pitcher in Japan's Nippon Professional Baseball, and belongs to Mainichi Broadcasting System, Inc. as a commentator in baseball live on radio and TV. Ota is a son of an American father and a Japanese mother, the adopted son of a Japanese step father and a Russian step mother, who emigrated to Japan because of the Russian Revolution in 1917.