The Trail des Monts de Gy is a trail running event held in Gy, a town in Haute-Saône, eastern France. Organized by Les Chauffe la semelle, it offers participants two trail distances, approximately 10 km or 20 km, along with rando-trail options for those preferring a walking or hiking pace in the same natural setting.
The courses follow the paths and trails in the hills surrounding Gy, featuring moderate climbs, forested areas, and clear vistas of the Franche-Comté landscape. Several hundred trail runners and hikers participate annually. The event maintains a local club atmosphere; registered runners receive a technical T-shirt, and a portion of the entry fees supports a local association.