Tromsø (Norwegian pronunciation: [ˈtɾumsœ] (listen); Northern Sami: Romsa;Finnish: Tromssa; Kven: Tromssa) is a city and municipality in Troms county, Norway. The administrative centre of the municipality is the city of Tromsø. Outside of Norway, Tromso and Tromsö are alternative spellings of the city. Tromsø is considered the northernmost city in the world with a population above 50,000. The most populous town north of it is Alta, Norway, with a population of 14,272 (2013).

Tromsø lies in Northern Norway. The municipality has a population of (2016) 73,480, but with an annual influx of students it has over 85,000 most of the year. It is the largest urban area in Northern Norway and the third largest north of the Arctic Circle (following Murmansk and Norilsk). Most of Tromsø, including the city centre, is located on the island of Tromsøya, 350 kilometres (217 mi) north of the Arctic Circle. In 2012, Tromsøya had a population of 36,088. Substantial parts of the urban area are also situated on the mainland to the east, and on parts of Kvaløya—a large island to the west. Tromsøya is connected to the mainland by the Tromsø Bridge and the Tromsøysund Tunnel, and to the island of Kvaløya by the Sandnessund Bridge. The city is warmer than most other places located on the same latitude, due to the warming effect of the Gulf Stream.

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