Reizo Koike (小池 禮三, Koike Reizō, December 12, 1915 – August 3, 1998) was a Japanese swimmer who specialized in the 200 m breaststroke. In this event he won a silver medal at the 1932 Olympics and a bronze medal at the 1936 Olympics, and set an unofficial world record in 100 m between these Olympics. During his career Koike won eight national titles.[1]