Koji Masuda (益田 弘二, Masuda Kōji, born 1 February 1944) is a Japanese boxer.
He competed in the men's light middleweight event at the 1964 Summer Olympics.
[1] At the 1964 Summer Olympics, he defeated Jannie Gibson of Rhodesia in the Round of 32 before losing to Joseph Gonzales of France in the Round of 16.
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