Gotland (, Swedish: [ˈɡɔ̌tːland] (listen); Gutland in Gutnish), also historically spelled Gottland or Gothland (), is Sweden's largest island. It is also a province, county, municipality, and diocese. The province includes the islands of Fårö and Gotska Sandön to the north, as well as the Karlsö Islands (Lilla and Stora) to the west. The population is 61,001, of which about 23,600 live in Visby, the main town. Outside Visby, there are minor settlements and a mainly rural population. The island of Gotland and the other areas of the province of Gotland make up less than one percent of Sweden's total land area. The county formed by the archipelago is the second smallest by area and is the least populated in Sweden. In spite of the small size due to its narrow width, the driving distance between the furthermost points of the populated islands is about 170 kilometres (110 mi).

Gotland is a fully integrated part of Sweden with no particular autonomy, unlike several other offshore island groups in Europe. Historically there was a linguistic difference between the archipelago and the mainland with Gutnish being the native language. In recent centuries, Swedish took over almost entirely and the island is virtually monolingually Swedish in modern times. The archipelago is a very popular domestic tourist destination for mainland Swedes, with the population rising to very high numbers during summers. Among reasons include the sunny climate and the extensive shoreline on mild water. During summer Visby hosts the political event Almedalen Week followed by the Medieval Week, further boosting visitor numbers. In winter, Gotland usually remains surrounded by ice-free water and has mild weather.

Gotland has been inhabited since approximately 7200 BC. The island's main sources of income are agriculture, food processing, tourism, information technology services, design, and some heavy industry such as concrete production from locally mined limestone. From a military standpoint, it occupies a strategic location in the center of the Baltic Sea.