Montgomery County Airpark (IATA: GAI, ICAO: KGAI, FAA LID: GAI) is a U.S. public airport located three miles (5 km) northeast of the city of Gaithersburg, in Montgomery County, Maryland, United States.

The airport was built by Silver Spring developer William E. Richardson in 1960, in an area that was then rural.

[3][4] The Montgomery County Planning Board voted 3–2 in favor of rezoning the land to allow the airport to be built.

[11] On December 8, 2014, a plane crashed into houses while on approach to Runway 14 at Montgomery County Airpark.

[12] On November 27, 2022, a Mooney M20J-201 (N201RF) crashed into a powerline while on approach to Runway 14 at Montgomery County Airpark.