Masahiko Tanaka (田中 昌彦, born 24 February 1941) is a Japanese master of Shotokan karate. He won the first of his two IAKF world championship Kumite titles in 1975,was part of the Japan team to win the team Kumite title in the third IAKF world championship and was twice JKA All-Japan kumite champion. He became the national coach of Denmark in 1975 and in 1978 returned to Japan where he currently manages the international affairs of the JKA.