Plattsburgh International Airport (IATA: PBG, ICAO: KPBG, FAA LID: PBG) is a county public-use airport located three nautical miles (6 km) south of the central business district of the city of Plattsburgh, within the Town of Plattsburgh in Clinton County, New York, United States. About 85 percent of the airport's passengers in 2013 were Canadians, mostly from Montreal.

The airport is located at the former Plattsburgh Air Force Base and has been owned by Clinton County since 2002. The old base is still being redeveloped by Plattsburgh Airbase Redevelopment Corporation, established in 1995 after the airbase closed. The airport's massive facilities have been upgraded to civilian aviation standards and the county fully transitioned here from Clinton County Airport as of June 2007.

Passenger service began on June 18, 2007, and Clinton County Airport has been shut down since then. All airline service in Plattsburgh goes through the airport, which has expanded its terminal building to accommodate more passengers and provide more gates for aircraft. Scheduled passenger service from this airport to Philadelphia, Pennsylvania is subsidized by the United States Department of Transportation via the Essential Air Service program.

The airport was closed to air traffic from April 13, 2021, to approximately June 22, 2021 due to the middle section of the runway being repaved.

It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a primary commercial service airport (more than 10,000 enplanements per year).