Shinzō Ōya (大屋 晋三, Ōya Shinzō, 5 July 1894 – 9 March 1980) was an entrepreneur and politician, who served as Minister of Commerce and Industry in post-war Japan. Ōya was born in what is now part of the town of Meiwa in Gunma Prefecture, where his father was a high school principal and his grandfather had been a samurai in the service of Kawagoe Domain. He graduated from what later became Hitotsubashi University in 1918. On graduation he joined the zaibatsu , and from 1925 went to work for Teijin, eventually becoming its president in November 1945.