The modern name Sweden is derived through back-formation from Old English Sweoþeod, which meant "people of the Swedes" (Old Norse Svíþjóδ, Latin Suetidi). This word is derived from Sweon/Sweonas (Old Norse Sviar, Latin Suiones). The Swedish name Sverige (a compound of the words Svea and Rike, with lenition of the consonant [k], first recorded in the cognate Sweorice in Beowulf) - literally means "Kingdom of the Swedes", excluding the Geats in Götaland.

Variations of the name Sweden are used in most languages, with the exception of Danish and Norwegian using Sverige, Icelandic Svíþjóδ, and the more notable exception of some Finnic languages where Ruotsi (Finnish) and Rootsi (Estonian) are used, names commonly considered etymologically related to the English name for Russia, referring to the people, Rus', originally from the coastal areas of Roslagen, Uppland.

The etymology of Swedes, and thus Sweden, is generally not agreed upon but may derive from Proto-Germanic Swihoniz meaning "one's own", referring to one's own Germanic tribe.

Situated in Northern Europe, Sweden lies west of the Baltic Sea and Gulf of Bothnia, providing a long coastline, and forms the eastern part of the Scandinavian Peninsula. To the west is the Scandinavian mountain chain (Skanderna), a range that separates Sweden from Norway. Finland is located to its north-east. It has maritime borders with Denmark, Germany, Poland, Russia, Lithuania, Latvia and Estonia, and it is also linked to Denmark (south-west) by the Öresund Bridge. Its border with Norway (1,619 km long) is the longest uninterrupted border within Europe.

Sweden lies between latitudes 55° and 70° N, and mostly between longitudes 11° and 25° E (part of Stora Drammen island is just west of 11°). At 449,964 km² (173,732 sq mi), Sweden is the 55th-largest country in the world, the 4th-largest country entirely in Europe, and the largest in Northern Europe. The lowest elevation in Sweden is in the bay of Lake Hammarsjön, near Kristianstad, at -2.41 m (-7.91 ft) below sea level. The highest point is Kebnekaise at 2,111 m (6,926 ft) above sea level.

Sweden has 25 provinces or landskap (landscapes), based on culture, geography and history. While these provinces serve no political or administrative purpose, they play an important role in people's self-identity. The provinces are usually grouped together in three large lands, parts, the northern Norrland, the central Svealand and southern Götaland. The sparsely populated Norrland encompasses almost 60% of the country.

About 15% of Sweden lies north of the Arctic Circle. Southern Sweden is predominantly agricultural, with increasing forest coverage northward. Around 65% of Sweden's total land area is covered with forests. The highest population density is in the Öresund Region in southern Sweden, along the western coast up to central Bohuslän, and in the valley of lake Mälaren and Stockholm. Gotland and Öland are Sweden's largest islands; Vänern and Vättern are its largest lakes. Vänern is the third largest in Europe, after Lake Ladoga and Lake Onega in Russia.