As coach Koichi Oshima (大島 公一, Oshima Koichi, born June 17, 1967) is a retired Japanese professional baseball player from Itabashi, Tokyo, Japan.

Oshima was a valuable switch hitter and a solid fielder, winning three Japanese golden glove awards at second base, and two Best Nine awards.

He dismissed an offer to work as a coach when the Osaka Kintetsu Buffaloes and Orix BlueWave merged, and played a season with the Tohoku Rakuten Golden Eagles before becoming a coach for the Orix Buffaloes in 2006.

He won a bronze medal in the 1992 Summer Olympics before entering the Japanese professional leagues.

You can help Wikipedia by expanding it.This biographical article relating to a Japanese baseball infielder is a stub.