Horstmann Peak is a 10,475-foot mountain in Idaho’s Sawtooth Range, located within the Sawtooth Wilderness of the Sawtooth National Recreation Area. It ranks as the eleventh highest peak in the range. The peak stands south-southeast of Mickey’s Spire, its line parent, and also lies south of Thompson Peak and north of Braxon Peak, placing it among a notable cluster of summits in this rugged mountain landscape.