Sweden, formally the Kingdom of Sweden, is a Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, Finland to the east, and is connected to Denmark in the southwest by a bridge–tunnel across the Öresund.

At 450,295 square kilometres (173,860 sq mi), Sweden is the largest Nordic country and the fifth-largest country in Europe. The capital and largest city is Stockholm. Sweden has a population of 10.5 million, and a low population density of 25.5 inhabitants per square kilometre (66/sq mi), with around 87% of Swedes residing in urban areas, which cover 1.5% of the entire land area, in the central and southern half of the country. Nature in Sweden is dominated by forests and many lakes, including some of the largest in Europe. Many long rivers run from the Scandes range, primarily emptying into the northern tributaries of the Baltic Sea. It has an extensive coastline and most of the population lives near a major body of water. With the country ranging from 55°N to 69°N, the climate of Sweden is diverse due to the length of the country.

Germanic peoples have inhabited Sweden since prehistoric times, emerging into history as the Geats (Swedish: Götar) and Swedes (Svear) and constituting the sea peoples known as the Norsemen. A unified Swedish state emerged during the late 10th century. In 1397, Sweden joined Norway and Denmark to form the Scandinavian Kalmar Union, which Sweden left in 1523. When Sweden became involved in the Thirty Years' War on the Protestant side, an expansion of its territories began, forming the Swedish Empire, which remained one of the great powers of Europe until the early 18th century. During this era Sweden controlled much of the Baltic Sea.

Sweden is a highly developed country ranked seventh in the Human Development Index. It is a constitutional monarchy and a parliamentary democracy, with legislative power vested in the 349-member unicameral Riksdag. It is a unitary state, divided into 21 counties and 290 municipalities. Sweden maintains a Nordic social welfare system that provides universal health care and tertiary education for its citizens. It has the world's 14th highest GDP per capita and ranks very highly in quality of life, health, education, protection of civil liberties, economic competitiveness, income equality, gender equality and prosperity. Sweden joined the European Union on 1 January 1995. It is also a member of the United Nations, NATO, the Nordic Council, the Schengen Area, the Council of Europe, the World Trade Organization and the Organisation for Economic Co-operation and Development (OECD).