Tromsøysundet
or is a strait located in Tromsø Municipality in Troms county, Norway. The long strait separates the island of Tromsøya from the mainland east of the island. The strait is crossed by the Tromsøysund Tunnel and by the Tromsø Bridge. The strait ranges from about wide. The strait connects to the Balsfjorden and Straumsfjorden to the south and into the Kvalsundet and Grøtsundet straits to the north.