Minnesota State Highway 18 (MN 18) is a 78.207-mile-long (125.862 km) highway in east-central Minnesota, which runs from its intersection with State Highway 25 in Brainerd and continues east to its eastern terminus at its intersection with State Highway 23 in Finlayson Township near Askov and Sandstone. The eastern terminus of Highway 18 is less than 1/2 mile west of an interchange with Interstate Highway 35 along Highway 23. For part of its route (5 miles), Highway 18 runs concurrent with U.S. Highway 169 in Crow Wing and Aitkin counties around the northwest side of Mille Lacs Lake.