Neihart is a town in Cascade County, Montana, United States. It is located in the center of Little Belt Mountains. The population was 51 at the 2010 census. It is part of the Great Falls, Montana, Metropolitan Statistical Area. It is one of only three places in the world where Neihart quartzite—reddish, coarse-grained sandstone with interbedded dark-green sandstone and shale—may be found (the town gives the mineral its name).