Seattle Paine Field International Airport (IATA: PAE, ICAO: KPAE, FAA LID: PAE), also known as Paine Field and Snohomish County Airport, is a commercial and general aviation airport serving the Seattle metropolitan area in the U.S. state of Washington. It is located in unincorporated Snohomish County, Washington, between the cities of Mukilteo and Everett, about 25 miles (40 km) north of Seattle.

Paine Field has two runways. 16R-34L, at 9,010 feet (2,750 m) in length, is suited for the majority of aircraft and sees occasional heavy traffic. Runway 16L-34R is 3,004 feet (916 m) in length, and suitable only for small aircraft. The Paine (PAE) VOR/DME is unusually mounted on top of a Boeing hangar. The airport has 456 general aviation hangars.

The airport was built in 1936 by the Works Progress Administration and began commercial service in 1939. It was named for an American airmail and Army Air Corps pilot, Topliff Olin Paine in 1941, shortly before the Army Air Corps began the occupation of Paine Field for military use. During his air mail career, Paine became nationally recognized for his accomplishments while flying through rugged terrain and snowstorms in the Rocky Mountains. From 1920 to 1922, Paine flew primarily out of Cheyenne, Wyoming, and Salt Lake City, Utah, for the Air Mail Service, becoming one of the top fliers in the Western Division.

The airport briefly returned to civilian use in the late 1940s, before conversion into an air force base during the Korean War. In 1966, the Boeing Company selected Paine Field for the site of its Everett assembly plant as part of the Boeing 747 program. The Boeing Everett Factory includes the largest building in the world by volume at 13,385,378 m3 (472,370,319 cu ft) and covers 98.7 acres (39.9 ha). Boeing began offering factory tours with the first rollout of the 747 in 1968. As of 2020 over 150,000 people come each year to visit the factory, which employs over 30,000 people. Across the airport to the west is The Boeing Store, a theater, and the Future of Flight Aviation Center, which runs the factory tour. To accommodate the Dreamlifter, a converted 747-400 which delivered 787 sections to the plant, a base was constructed on the western edge of Paine Field's runway and opened in 2013.

By the 1970s, the airport had grown into a hub for light aviation and manufacturing, lacking commercial service. The county government sought to begin commercial service at Paine Field as early as the 1980s but was halted by opposition from neighboring cities. In March 2019, Paine Field resumed commercial service at a newly constructed terminal. The Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2023–2027 categorized it as a non-hub primary commercial service facility. The terminal was named the best regional airport in the world by Monocle magazine and one of the best small airports in the United States by USA Today.

Paine Field is also home to Aviation Technical Services (ATS), one of the nation's largest aviation maintenance facilities. Paine Field is home to four flight schools making it a popular destination for flight training. There are also a number of flying clubs on the field.

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