Southwest Minnesota Regional Airport or Marshall/Ryan Field (IATA: MML, ICAO: KMML) is a general aviation airport located 1 mile west of the central business district (CBD) of Marshall, Minnesota, United States.

[1] For the period ending 31 August 2010, the airport had 22,995 flights at an average of 63 per day.

As of August 2010, there are 28 aircraft based on the field: 19 single-engine, 6 multi-engine, and 3 jet.

[3] Starting in the mid-1970s and continuing until the early 1980s, Lake State Airways operated Piper PA-31 Navajo aircraft on a route between Marshall and Minneapolis with stops in New Ulm and Saint Paul.

[4] The route was later expanded to originate in Sioux Falls, South Dakota.