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. It is primarily a general aviation facility, though passenger air service did once exist on Midwest Aviation, also known as Lake State Airways. The namesake for Ryan Field is Matthew Ryan, commissioner of small airport around Minneapolis.

The airport contains two asphalt paved runways: Runway 12/30 measuring 7221 x 100 ft (2201 x 30 m) and Runway 2/20 measuring 3999 x 75 ft (1219 x 23 m). This airport does not have an air traffic control tower.

Midwest Aviation provides fixed-base operations.

For the period ending 31 August 2010, the airport had 22,995 flights at an average of 63 per day. 66% general aviation (42% transient general aviation, 24% local), 34% air taxi and <1% military. For the year ending 31 December 2008, the airport had a total of 8 enplanements.

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

Airlines	Destinations
UPS	Minneapolis/St. Paul

In December 1972 Mississippi Valley Airlines scheduled service to Minneapolis–St. Paul International Airport and Willmar Municipal Airport.

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

• List of airports in Minnesota

• Resources for this airport:
  • FAA airport information for MML
  • AirNav airport information for KMML
  • ASN accident history for MML
  • FlightAware airport information and live flight tracker
  • NOAA/NWS weather observations: current, past three days
  • SkyVector aeronautical chart, Terminal Procedures