Fort Supply was a Mormon pioneer-era fort in Green River County, Utah Territory, United States. Established in 1853 and abandoned during the Utah War of 1857, the fort served to solidify Mormon influence and control in the area, as a base for local missionary efforts, and to supply food and other provisions for pioneers headed to Salt Lake City. The site of the former fort is located near the modern-day community of Robertson, Uinta County, Wyoming, and a monument commemorating the settlement is maintained as a satellite site of Wyoming's Fort Bridger State Historic Site.