Lamoille Lake is a glacial tarn in the Ruby Mountains of Elko County, Nevada, United States. It is within the Ruby Mountains Ranger District of the Humboldt-Toiyabe National Forest. The lake is located at the head of Lamoille Canyon, at approximately (40°34.6′N115°23.7′W), and at an elevation of 9,747 feet (2971 meters). It has an area of approximately 13.6 acres (5.5 hectares).