Minnesota State Highway 70 (MN 70) is a 29.333-mile-long (47.207 km) highway in east-central Minnesota, which runs from its intersection with State Highway 65 in Brunswick and continues east to its eastern terminus at the Wisconsin state line (near Grantsburg, WI), where it becomes Wisconsin Highway 70 upon crossing the St. Croix River.

Highway 70 serves as an east–west route between Mora, Brunswick, Rock Creek, and Grantsburg, WI.

The route has an interchange with Interstate 35 at the city of Rock Creek.

Highway 70 in Minnesota carries a great amount of recreational traffic to Wisconsin, as Twin Cities residents try to avoid nearby U.S. Highway 8, which is often a traffic congested route.

The route in Minnesota was numbered to correspond with Wisconsin Highway 70.