Koichi Oita (種田 孝一, Oita Koichi, April 9, 1914 – September 11, 1996) was a Japanese football player and manager.
In 1936, when he was a Tokyo Imperial University student, he was selected Japan national team for 1936 Summer Olympics in Berlin.
Japan completed a come-from-behind victory against Sweden.
In 2016, this team was selected Japan Football Hall of Fame.
September 11, 1996, Oita died of heart failure in Bunkyo, Tokyo at the age of 82.