| Yasuko Kosuge | |
| Birth Date: | 26 May 1974 |
| Birth Place: | Hayama, Kanagawa, Japan |
| Weight: | 540NaN0 |
| Classes: | Sailboard |
| Club: | Toyama Sailing Federation |
| Show-Medals: | yes |
is a Japanese former windsurfer, who specialized in the RS:X class.[1] She was the country's top female windsurfer for the 2008 Summer Olympics, finishing in thirteenth place.[2] A member of Toyama Sailing Federation, Kosuge trained most of her competitive sporting career for the national team.
Kosuge competed for the Japanese sailing squad, as a 34-year-old, in the inaugural women's RS:X class at the 2008 Summer Olympics in Beijing. She topped the selection criteria in a duel against the quota recipient Yuki Sunaga for the country's RS:X berth, based on her cumulative scores in a series of international regattas approved by the Japan Sailing Federation.[3] Kosuge enjoyed the initial half of the series with a couple of top ten marks recorded, before fading temporarily towards the middle of the fleet. She made a late surge to finish seventh on the final leg but fell short to enter the medal race by the narrowest margin, sitting her in thirteenth overall with 102 net points.[2] [4]