Tromsøysund is a former municipality in Troms county in Norway. The 1,530-square-kilometre (590 sq mi) municipality existed from 1838 until its dissolution in 1964. The municipality encompassed most of what is now Tromsø Municipality including areas on the island of Kvaløya and on the mainland. It completely surrounded the city of Tromsø, both on a number of islands as well as on the mainland. The municipality included the villages of Bjerkaker, Tromsdalen, and Movik. The administrative centre was the village of Tromsdalen, just across the strait from the city of Tromsø.

Tromsø is a municipality in Troms county, Norway. The administrative centre of the municipality is the city of Tromsø.