Kasfjord is a village in the municipality of Harstad in Troms county, Norway. The village is located at the end of the Kasfjorden on the north side of Hinnøya island, about 10 kilometres (6.2 mi) west of the town of Harstad and about 12 kilometres (7.5 mi) south of Elgsnes. The Kasfjordvannet lake is located along the east side of the village. The 0.34-square-kilometre (84-acre) village has a population (2011) of 252. The population density is 741 inhabitants per square kilometre (1,920/sq mi).