Edith 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. 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.