New Castle Municipal Airport (ICAO: KUCP, FAA LID: UCP) is a small municipal airport located in Union Township, Lawrence County, Pennsylvania serving Lawrence County, Pennsylvania, part of the Pittsburgh metropolitan area. Union Township is an outskirt of New Castle, Pennsylvania hence the name. The airport is located four nautical miles (7 km) northwest of the central business district of New Castle. The airport is a public-owned airport and is controlled by the Lawrence County Airport Authority.

This airport is assigned a three-letter location identifier of UCP by the Federal Aviation Administration, but it does not have an International Air Transport Association (IATA) airport code.