U.S. Route 287 (US 287) is a 281.183-mile (452.520 km) north-south U.S. Numbered Highway in Montana, United States, that connects Yellowstone National Park's West Entrance iwth to U.S. Route 89 in Choteau, about 100 miles (160 km) south of the Canadian border.

The highway heads north, running concurrently with US 191 for 8 miles (13 km) before it heads west for 22 miles (35 km), passing along the north shores of Hebgen Lake and Earthquake Lake, to Montana Highway 87 (MT 87).

The Montana State Highway Commission first assigned the MT 287 designation in 1958 to a cross-state route from Yellowstone National Park at West Yellowstone to the Canada–United States border at the Piegan–Carway Border Crossing between Babb and Cardston, Alberta.

MT 287 continued with US 10N north and west to Helena, then the route ran concurrently with US 91 (along the modern I-15 corridor) to Wolf Creek.

MT 287 continued east with US 10 to rejoin its previous route west of Three Forks.