Troms (trôms, tro͝oms), county (1995 pop. 150,606), c.10,070 sq mi (26,080 sq km), N Norway, bordering on the Norwegian Sea (an arm of the Atlantic Ocean) in the west and on Sweden and Finland in the east. Tromsø is the capital. The county has many deep fjords and numerous offshore islands, including some of the Vesterålen group. Fishing, canning, stock raising, and boatbuilding are the main industries, and there is also some mining and farming.