Montana Highway 81
MT 81 highlighted in red
Route information
Maintained by MDT
Length	42.446 mi[1] (68.310 km)
Major junctions
West end	MT 80 north of Arrow Creek
East end	US 191 at Brooks
Location
Country	United States
State	Montana
Counties	Fergus
Highway system
Montana Highway System Interstate US State Secondary
← MT 80 → MT 82

Montana Highway 81 (MT 81) is a state highway in the U.S. state of Montana. The highway begins at an intersection with MT 80 north of the hamlet of Arrow Creek. The highway extends eastward from this point for approximately 42 miles (68 km), ending at an intersection with U.S. Route 191 (US 191) at the post office of Brooks. The landscape traversed by MT 81 is uneven and largely rural, used mainly for agriculture and livestock grazing. For much of its length, the highway is roughly paralleled by the main line of Central Montana Rail, which is headquartered in Denton.

Before receiving its current designation, MT 81 was designated as Secondary Highway 235.

The entire route is in Fergus County.

Location	mi[1]	km	Destinations	Notes
​	0.000	0.000	MT 80 – Stanford, Fort Benton	Western terminus
Denton	13.161	21.181	S-207
​	14.885	23.955	S-547
​	42.446	68.310	US 191 – Lewistown, Malta	Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

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