Kenji Kimihara (君原 健二, Kimihara Kenji, born March 20, 1941) is a retired Japanese long-distance runner.

He competed in the marathon at the 1964, 1968 and 1972 Olympics and finished in eighth, second and fifth place, respectively.

Kimihara raced in the 2016 Boston Marathon, celebrating the 50th anniversary of his 1966 win.

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