Montana Highway 25 is a state highway located in the U.S. State of Montana.

Highway 25's western terminus is at U.S. Route 2 in Wolf Point, Montana. The route heads northeast parallel to US 2 and a railroad. After bending southeastward, it passes the Lyman Clayton Airport and the Airport Golf Club, ending at Montana Highway 13, just to the north of the Missouri River.

During the 1930s, an old alignment of Highway 25 existed from Lewistown to Billings.

The entire route is in Roosevelt County.