Tom Madsen (Dutch Harbor) Airport (IATA: DUT, ICAO: PADU, FAA LID: DUT) is a state-owned public-use airport in City of Unalaska, on Amaknak Island in the Aleutian Islands, off the coast of the U.S. state of Alaska. It is located near the Bering Sea coast of Unalaska Island, 800 miles (1,300 km) southwest of Anchorage and 1,950 miles (3,140 km) from Seattle.

The official name of the City of Unalaska's port is Dutch Harbor. That name is also applied to the portion of Unalaska on Amaknak Island, which is located across a bridge from the rest of the city on Unalaska Island. Therefore, the airport is sometimes referred to as Dutch Harbor Airport. In 2002, the State of Alaska renamed it Tom Madsen Airport in honor of Charles Thomas Madsen Sr., a bush pilot who was killed in an airplane accident that year. However, the Federal Aviation Administration still refers to it as Unalaska Airport.

Scheduled commercial airline service was provided by PenAir, a code share partner of Alaska Airlines until October 2019, and prior to that Alaska Airlines operated Boeing 737-200 Combi jetliners to the airport with these aircraft transporting a combination of passengers and freight on the main deck of the aircraft. However, due to load restrictions as a result of the short runway as well as cancellations due to weather, Alaska Airlines then contracted the service via a code sharing arrangement to PenAir in 2004. PenAir initially operated Saab 340 and then Saab 2000 regional turboprop aircraft into the airport.