Isagi Osumi
is a Japanese former swimmer. He competed in the men's 200 metre backstroke at the 1964 Summer Olympics. He later became a reporter for the Sports Nippon newspaper, eventually rising to become a member of the board of directors. He also did sports commentary on television.

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1942 births
Living people
Japanese male backstroke swimmers
Olympic swimmers for Japan
Swimmers at the 1964 Summer Olympics
Place of birth missing (living people)