Farley Lake is a small alpine lake in Custer County, Idaho, United States, located high in the Sawtooth Mountains in the Sawtooth National Recreation Area. The lake is approximately 16.5 miles (26.6 km) south of Stanley. There are two small islands in Farley Lake, the largest of which is only about 200 feet (61 m) long. A trail from the Yellow Belly Lake and Pettit Lake trailheads leads towards Edith Lake via Farley Lake. These trailheads can be accessed from State Highway 75 via Sawtooth National Forest road 208.