Sør-Varanger (Northern Sami: Máttá-Várjjat, Kven: Etelä-Varenki, Finnish: Etelä-Varanki, Russian: Сёр-Вара́нгер/Syor-Varánger) is a municipality in Troms og Finnmark county, Norway. The administrative centre of the municipality is the town of Kirkenes. Other settlements in the municipality include the villages of Bjørnevatn, Bugøynes, Elvenes, Grense Jakobselv, Hesseng, Jakobsnes, Neiden, and Sandnes. Located west of the Norway–Russia border, Sør-Varanger is the only Norwegian municipality that shares a land border with Russia, with the only legal border crossing at Storskog.
The 3,972-square-kilometre (1,534 sq mi) municipality is the 6th largest by area out of the 422 municipalities in Norway. Sør-Varanger is the 113th most populous municipality in Norway with a population of 10,171. The municipality's population density is 2.9 inhabitants per square kilometre (7.5/sq mi) and its population has increased by 6.9% over the last decade.