Harstad (Northern Sami: Hárstták) is a town in Harstad Municipality in Troms og Finnmark county, Norway. The town is also the administrative centre of the municipality of Harstad. The 11.15-square-kilometre (2,760-acre) town has a population (2017) of 20,953 which gives the town a population density of 1,879 inhabitants per square kilometre (4,870/sq mi). It is the second-largest town in the former Troms county, after the city of Tromsø, and it is the largest town in Central Hålogaland.