Duncan's Peak, at 11,755 feet (3,583 m) above sea level, is the ninth-highest peak in the Pioneer Mountains of the U.S. state of Idaho. The peak is located on the border of Sawtooth and Salmon-Challis National Forests as well as Blaine and Custer counties. It is the 28th-highest peak in Idaho and about 0.6 miles (0.97 km) northwest of Hyndman Peak.[2][3][4]