Julsundet is a 15-kilometre (9.3 mi) long strait connecting the Norwegian Sea to the Romsdalsfjorden.

The strait is located about 10 kilometres (6.2 mi) west of the town of Molde in Møre og Romsdal county, Norway.

The Frænfjorden empties into the Julsundet strait at the small island of Vågøya.

It has a significant tidal current and is exposed to strong northerly winds.

Julsundet was heavily fortified by the Germans during World War II.