Mount Ellen, Mountain summit in Garfield County, Utah.

Mount Ellen is the highest summit of the Henry Mountains, standing 3,507 meters above sea level in northeastern Garfield County, Utah. Its North Summit Ridge can be reached by a short hike from an unpaved road, and the peak lies 16 kilometers west of Utah State Route 95 and 25 kilometers east of Capitol Reef National Park.

The mountain was named after Ellen Powell Thompson, wife of an early surveyor whose family was connected to explorer John Wesley Powell. The Henry Mountains were the last major mountain range to be mapped and documented in the continental United States.

Almon Harris Thompson named the mountain after his wife Ellen Powell Thompson, who was connected to the explorer John Wesley Powell.

The mountain is accessed via a hiking trail starting from Bull Pass, a remote high-altitude location that requires a vehicle with high ground clearance to reach. Visitors should prepare for steep terrain, thin air, and exposed conditions typical of high peaks in arid regions.

In September 1895 a U.S. Army Signal Corps detachment on Mount Ellen and Mount Uncompahgre in Colorado set a world heliograph record, flashing mirror signals 183 miles (about 295 km) with 8-inch mirrors and telescopes. The mountain's Paiute name was Un tar re, and it was also called First Mountain.