MBS International Airport (IATA: MBS, ICAO: KMBS, FAA LID: MBS), located in Freeland, Michigan, is a commercial and general aviation airport serving the nearby cities of Midland, Bay City, and Saginaw. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021, in which it is categorized as a non-hub primary commercial service facility.

MBS was formerly named Tri-City Airport or Freeland Tri-City Airport, reflecting the “Tri-Cities” nickname of the region. The airport was renamed MBS International Airport in 1994 (representative of its IATA airport code) to prevent confusion with other airports named "Tri-City Airport" across the United States. While owned by three municipalities, the IATA and FAA city name associated with the airport is Saginaw, i.e. the control tower is known to pilots as "Saginaw Tower".

The commercial airport is a special municipal body owned by Bay County and the cities of Midland and Saginaw. The airport's name is an initialism formed from the names of these three communities and it is governed by a nine-member commission made up of three members from each of them.

In October 2012, MBS opened a new $55 million six-gate terminal to replace the old three-gate terminal, which was built in 1965. The construction on this project was completed nearly a year ahead of schedule.