Kenji Watanabe (渡辺 健司 Watanabe Kenji?) (born July 17, 1969) is a retired male breaststroke swimmer from Japan. He represented his native country in three consecutive Summer Olympics, starting in 1984. His best Olympic result was the 7th place (2:14.70) in the Men's 200m Breaststroke event at the 1992 Summer Olympics in Barcelona, Spain. He is the grandson of Hisakichi Toyoda, who won the gold medal in the men's 4×200m freestyle event at the 1932 Summer Olympics.
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