Thibe Deseyn

Thibe Deseyn (born 18 March 2003) is a Swiss ski mountaineer.

Career Deseyn represented Switzerland at the 2020 Winter Youth Olympics in ski mountaineering, an event making its Youth Olympics debut. She began the Youth Olympics with a silver medal in the individual race with a time of 59:38.58. She also won a gold medal in the mixed relay with a time of 35:07.

She competed at the 2023 World Championship of Ski Mountaineering and won a gold medal in the youth mixed relay, along with Jon Kistler, with a time of 29:45.9. She also won a gold medal in the under-20 vertical race, and bronze medals in the sprint race and individual races. She again competed at the 2025 World Championship of Ski Mountaineering and won a gold medal in the under-23 vertical race with a time of 24:23.6, and a silver medal in the individual race with a time of 1:47:31.4, finishing behind gold medalist Margot Ravinel.

During the first mixed relay race of the 2025–26 ISMF Ski Mountaineering World Cup on 6 December 2025, she earned his first career World Cup podium, finishing in third place, along with Arno Lietha.