Pittsburgh-Butler Regional Airport (IATA: BTP, ICAO: KBTP, FAA LID: BTP), also known as the Butler County Airport or K. W. Scholter Field, is a public airport in Pennsylvania, United States. It is owned by the Butler County Airport Authority. The 2025-2029 National Plan of Integrated Airport Systems lists the airport as a regional reliever airport.

Pittsburgh-Butler Regional Airport is located in Penn Township, 5 miles (8 km) southwest of the central business district of Butler, the county seat of Butler County, Pennsylvania, United States. The airport serves the northern suburbs of the Pittsburgh metropolitan area.

Pittsburgh-Butler Regional Airport, formerly Butler County Airport, opened as the Pittsburgh-Butler Airport on September 27 and 28, 1929, with much fanfare and aircraft demonstrations. The airport originally had three turf runways, one of which was later paved, and a turf runway closed. The remaining turf runway ran N/S. The airport was opened by Pennsylvania Aviation Industrial Corp. (PAIC), owned by George Hann, the Mellon interests and some others, who hoped to lure Pittsburgh traffic.

During the Great Depression, the airport shut down for some years when there was little business. The two large hangars were used to store corn.

In the 1930s, John Graham along with Kenny Sholter helped to clean out the hangars and reopened the airport. It was then renamed the Butler-Graham Airport.

During its early years, the airport served as an important training area for potential pilots. Amelia Earhart received her instrument flight certificate there while practicing for her solo flight over the Atlantic Ocean in 1932. It was at the airport that Earhart had the long-range fuel tanks installed on her Lockheed Vega. Another notable aviator was C.G. Taylor, who in 1935 moved his Taylorcraft Aircraft company to Butler. His new planes were tested at the airport, and his Taylorcraft B model was introduced here. During World War II. Graham Aviation trained so many pilots under the Civilian Pilot Training Program that Piper Cubs had to be stored tilted up on their noses to fit them all in the hangars.

For many years, Butler-Graham served as an alternate airport for TWA should the weather be down at Allegheny County Airport, which from 1931 to 1952 was the primary airport of the city of Pittsburgh until Pittsburgh International Airport opened.

By the late 1990s, the airport was too small to handle the number of aircraft coming in, so plans were made to extend the runway by 800 feet (240 m). The extension of the single runway was completed in 2004.