Little Diamond Peak is an 11,272-foot mountain in Idaho’s Lemhi Range, located in Butte County along the border of Caribou-Targhee National Forest and Salmon-Challis National Forest. Its summit stands 1.8 miles south of Shoshone John Peak and 2.8 miles south of Big Boy Peak, its line parent. Reaching 11,272 feet, it ranks as the 68th highest peak in Idaho, placing it among the state’s notable high summits.