Årstein is the administrative centre of Gratangen Municipality in Troms og Finnmark county, Norway. The village is located on the north side of the Gratangsfjorden at the narrowest point along the fjord. The crosses the fjord here. The village is located about 6 kilometres (3.7 mi) northwest of the village of (at the head of the fjord) and about 15 kilometres (9.3 mi) from the village of (where the Gratangsfjorden empties into the Astafjorden).