Minnesota State Highway 105 (MN 105) is a 13.645-mile-long (21.959 km) highway in southeast Minnesota, which runs from Mitchell County Road S70 at the Iowa state line and continues north to its northern terminus at its interchange with Interstate Highway 90 outside Austin.

Highway 105 is also known as 12th Street SW and Oakland Avenue W in the city of Austin.

[3] From 1934 to 1980, the northern terminus of Highway 105 was previously at old U.S. 16 / old Minnesota 116 (Oakland Avenue) in Austin.

Minnesota 116 was turned back to city maintenance in 1980.

The 1.6 mile connecting route of old Minnesota 116 (Oakland Avenue) between Highway 105 at 12th Street and Interstate 90 on the western side of Austin was then added as an extension of 105 in 1980.