Minnesota State Highway 266 (MN 266) was a 13.860-mile-long (22.306 km) highway in southwest Minnesota that had connected the communities of Wilmont and Reading to the city of Worthington. It was decommissioned in 2004, and was renumbered Nobles County State-Aid Highway 25.
^"Chapter 663-H.F. No. 1792", Session Laws of Minnesota for 1949, Earl L. Berg, Commissioner of Administration, pp. 1177–1185