Minnesota State Highway 120 (MN 120) is a 7.2-mile-long (11.6 km) state highway in Minnesota, which runs from a point south of its interchange with Interstate 94 (I-94) in Maplewood (near Landfall) and continues north to its northern terminus at its intersection with MN 244 and County Road 15 (CR 15) at the White Bear Lake–Mahtomedi boundary line.

MN 120 serves as a north–south route between the communities of Maplewood, Oakdale, North St. Paul, White Bear Lake, and Mahtomedi.

[3] The Minnesota Legislature approved the removal of MN 120 from the state trunk highway system in Washington and Ramsey counties in 2001.

Before 2002, the route had continued south of I-94 on present day CSAH 72/CSAH 25 (the Maplewood–Woodbury boundary line) until reaching Valley Creek Road in Woodbury.

In 2015, the state turned back the portions of MN 5 along and east of Century Avenue over to Washington County.