Libby is a city in and the county seat of Lincoln County, Montana, United States. The population was 2,626 at the 2000 census.
Libby is located at 48°23′17″N 115°33′13″W / 48.38806°N 115.55361°W / 48.38806; -115.55361 (48.388128, -115.553707), along U.S. Route 2.
According to the United States Census Bureau, the city has a total area of 1.3 square miles (3.3 km²), all of it land. Located in the Kootenai National Forest, between the Cabinet Mountains to the south and the Purcell Mountains to the north. The town lies in the heart of the Kootenai Valley along the Kootenai River, and downstream from the Libby Dam. Libby is at an elevation of 2096 feet (639 m).