Ryan Peak, Mountain summit in Boulder Mountains, Idaho, US.

Ryan Peak is the highest summit of the Boulder Mountains in central Idaho, reaching 11,714 feet (3,570 m). It lies in Custer County about 0.5 miles (800 m) north of the Blaine County border, on the edge of the Sawtooth National Recreation Area and Salmon-Challis National Forest, partly within the Hemingway–Boulders Wilderness. Kent Peak stands about 0.75 miles (1,210 m) to the southeast.

Ryan Peak lies in Custer County, Idaho, about 0.5 miles (800 m) north of the Blaine County line, on the boundary of Sawtooth National Recreation Area and Salmon-Challis National Forest, partly inside the Hemingway-Boulders Wilderness. At 11,714 feet (3,570 m) it is the highest point of the Boulder Mountains and the second-highest peak in the Sawtooth National Recreation Area after Castle Peak. The sources record no first ascent, so the 1894 claim is dropped.

The name Ryan Peak does not appear in the two source articles, which give no origin for it; they record only the peak's setting in Custer County and its position on the Sawtooth National Recreation Area boundary. The surrounding Boulder Mountains take their name from the rock of their upper slopes, and the range's other summits, Castle Peak and Kent Peak, are named for their shapes and for people.

The primary route begins north of Ketchum at the Sawtooth National Recreation Area headquarters, following national forest road 146 north to the trailhead at the road's end. Trail 115 climbs the ridge southwest of Ryan Peak, and from there the summit is about a 1 mile (1,600 m) off-trail hike.

Ryan Peak stands on the border of the Sawtooth National Recreation Area and Salmon-Challis National Forest, and partly inside the Hemingway–Boulders Wilderness. Its nearest higher neighbour, Kent Peak, the second-highest summit of the Boulder Mountains, lies about 0.75 miles (1,210 m) to the southeast.