Garnet is a ghost town in Granite County, Montana, United States. Located on the dirt Garnet Range Road, it is an abandoned mining town that dates from the 1860s. In First Chance Gulch in western Montana, the town is located 11 miles up the Garnet Range Road, in mountains and forest. The town is at approximately 6,000 feet (1,800 m) elevation.

The town was listed on the National Register of Historic Places as the Garnet Historic District, in 2010. The listing included 82 contributing buildings, 46 contributing structures, and 56 contributing sites, as well as four non-contributing buildings, on 134 acres (54 ha).

Garnet is located 11 miles (18 km) north of the junction of Interstate 90, U.S. Route 12 and Bear Gulch Rd. in the Bureau of Land Management's Garnet Resource Area.