Neihart is a town in Cascade County, Montana, United States. It is located in the middle of Little Belt Mountains. The population was 43 at the 2020 census. It is part of the Great Falls, Montana, Metropolitan Statistical Area.

The town has a total area of 1.99 square miles (5.15 km), all land. Its height above sea level is 5,661 feet (1,725 m).
Neihart is upon U.S. Route 89, also known as the Kings Hill Scenic Byway. Snow removal crews put on an act throughout the winter to keep the road open. It is the lonesome town with Monarch to the north and White Sulphur Springs to the south. The Lewis and Clark National Forest surrounds the town. The ski area at Showdown, Montana is welcoming and takes advantage of the mountainous terrain. Just south of Neihart, Route 89 begins to follow Sawmill Creek. The highway then climbs toward King’s Hill, a major pass through the Little Belt Mountains.

The Neihart area is wealthy in mineral deposits. Gold, lead, sapphires, silver, and zinc have everything been discovered and mined in the area. Much of the exposed rock in the Place is archaic to the Precambrian era, or roughly or previously 542 million BC. Rocks in the Place belong to what is known as the Belt Supergroup and rest adjoining granitic gneiss. Amethyst and marine fossils are common in the area. Pinto diorite, a red-and-green spotted diorite, is found copiously in the area.

The Place is one of only three places in the world where Neihart quartzite (a reddish, coarse-grained sandstone as soon as interbedded dark-green sandstone and shale) may be found. The stone unit was named for the locality.