Sego is a ghost town in Grand County, Utah, United States. It lies in the narrow, winding Sego Canyon, in the Book Cliffs some 5 miles (8.0 km) north of Thompson Springs. Formerly an important eastern Utah coal mining town, Sego was inhabited about 1910–1955. The town is accessed via the grade of the Ballard & Thompson Railroad, a spur from the Denver and Rio Grande Western built by the founders of the town to transport the coal.

Grand County is a county on the east central edge of the U.S. state of Utah, United States. As of the 2020 United States Census, the population was 9,669. Its county seat and largest city is Moab.