Skiathos Alexandros Papadiamantis Airport (IATA: JSI, ICAO: LGSK) is an airport on the island of Skiathos, Greece. Its 5,341-foot (1,628-meter) runway is able to accommodate aircraft up to the size of a Boeing 767-200. The runway is characterised as 'short and narrow'. Because of the uneven terrain on the island of Skiathos, Skiathos Airport was created by reclaiming land from the sea between Skiathos island and the smaller island of Lazareta (a former leper colony) effectively joining the two islands into one larger island, though it was built on land already part of Skiathos. The location was chosen by a mechanic who lived in Volos. The airport is named after Alexandros Papadiamantis, a Greek novelist and native of the island.

The airport's short runway and its proximity to an adjacent public road have made it a popular destination for planespotters. It is often compared to Princess Juliana International Airport on Saint Maarten since both airports offer the public an ability to legally experience landing approaches and takeoffs at very close range.