Montana Highway 16 (MT 16) is a 152.371-mile-long (245.217 km) state highway in the US state of Montana. It begins in West Glendive at a Business Loop of Interstate 94 (I-94), and ends at the on the Saskatchewan border. The northern portion from U.S. Route 2 (US 2) at Culbertson to the Canada–United States border is proposed as part of the Theodore Roosevelt Expressway.