Grundy Municipal Airport (ICAO: KGDY, FAA LID: GDY) is a public-use airport located three nautical miles (6 km) southwest of the central business district of Grundy, a town in Buchanan County, Virginia, United States. It is publicly owned by the Town of Grundy and is operated by the Grundy Municipal Airport Commission. Grundy Municipal is the only airport operating in Buchanan County. Small personal and charter planes use the facility.