Parley's Canyon is a canyon located in the U.S. state of Utah. The canyon provides the route of Interstate 80 (I-80) (and previously the Lincoln Highway, U.S. Route 40, and a railroad) up the western slope of the Wasatch Mountains and is a relatively wide, straight canyon other than near its mouth. The mountain pass at the top of the canyon is known as Parley's Summit. With an elevation of , the pass is the highest point along I-80 in the state of Utah. Both features are named for Parley P. Pratt, an early settler of the Salt Lake Valley and Mormon leader who surveyed the area to find a better transportation route through the Wasatch Mountains than the previous route which traversed Emigration Canyon.