Tadahiro Kosaka (; born February 10, 1960) is a retired Japanese male race walker. He competed for Japan at three consecutive Summer Olympics: 1988, 1992, and 1996.
International competitions 1988Olympic GamesSeoul, South Korea47th20 km31st50 km1990Asian GamesBeijing, China 3rd50 km1991World ChampionshipsTokyo, Japan13th50 km1992Olympic GamesBarcelona, Spain24th50 km1994Asian GamesHiroshima, Japan 3rd50 km1996Olympic GamesAtlanta, United States29th50 km
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