Lelystad (Dutch pronunciation: [ˈleːlistɑt] ^ⓘ) is a Dutch municipality and the capital city of the province of Flevoland in the central Netherlands. The city, built on reclaimed land, was founded in 1967 and was named after Cornelis Lely, who engineered the Afsluitdijk that made the reclamation possible. Lelystad is situated approximately three metres (10 feet) below sea level.

Lelystad is built on the seabed of the former Zuiderzee. About 6,500 years ago, this wetland was above high tide level and inhabited; the Netherlands have steadily subsided since. Near Lelystad at Swifterbant, the oldest human skeletons in Western Europe were discovered. Due to rising water levels and storms, the peatlands were washed away, and the Lacus Flevo (in Roman times) grew to be the Almere (Middle Ages) and became the Zuiderzee. The Zuiderzee (Southern Sea) was the main transport route from Amsterdam to the North Sea and the Hanseatic League cities. Due to the many shipwrecks in Flevoland, Lelystad now houses the National Centre for Maritime History, with a museum and the shipyard that has built the Batavia replica.

After the Second World War the Zuiderzee Works continued, constructing the polder of Eastern Flevoland. In 1950 work commenced on several construction islands in the middle of the IJsselmeer. Lelystad-Haven was the largest island, and its wooden barracks housed a community of dyke-builders. In 1955 they reached the mainland, which made it possible to drive to Lelystad by car. One of the three pumping stations, which drained the polder in June 1957, was the diesel-powered Wortman in Lelystad-Haven. Until 1967 the only inhabitants of Lelystad were technical engineers and laborers and superintendents, living on the former construction island.

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Lelystad has a large population of Surinamese origin (5,225); most residents of a non-Western background live in the east of the city. Lelystad also has significant Moroccan (2,615) and Turkish (2,278) communities, most of whom reside in the northeastern part of the city. There were 2,059 residents with an Antillean background.

Lelystad is the largest municipality in the Netherlands in area, but a large part of that area is water: Markermeer and IJsselmeer. Another major area is the internationally famous nature park of Oostvaardersplassen, which arose naturally when the polder of South Flevoland was drained. Lelystad is also surrounded by a square of woodlands and parks and flat farmland. The importance of the landscape and sky is emphasized by several pieces of land art: engineers' work and works such as the Observatorium by Robert Morris (see below).

The artificial islands of Marker Wadden lie immediately to the northwest of Lelystad. Construction started in 2016, and the first islands have already become important wildlife sites, with many species of birds coming to the islands during the breeding season.

Lelystad has several tourist attractions, including: