Koji Watanabe (渡邊康二 Watanabe Kōji?, born 19 January 1942 in Ashiya, Hyogo) is a former Japanese international tennis player. He competed in the Australian Open two times, in 1965 and 1969. He also served as coach for Japan's Davis Cup team (1971–1974) and as vice-chairman of the Japan Tennis Association.
- Koji Watanabe at the Association of Tennis Professionals
- Koji Watanabe at the International Tennis Federation
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