The Sunnylvsfjorden is a fjord in Stranda and Fjord in the Møre og Romsdal county of Norway. The 26-kilometre (16 mi) long Sunnylvsfjorden is one of the innermost branches of the large Storfjorden. The fjord ranges from 600 to 2,000 metres (2,000 to 6,600 ft) wide and reaches 452 metres (1,483 ft) below sea level at its deepest point, just west of Skrenakken near the mouth of the fjord. The famous Geirangerfjorden branches off to the west from the Sunnylvsfjorden.
Just south of the village of Helsem, the Storfjorden splits off into the Norddalsfjorden (to the east) and Sunnylvsfjorden (to the south). The village of Hellesylt sits at the end of this fjord. The historic Me-Åkernes farm lies on a cliff on the north side of the fjord. This former municipality of Sunnylven was centered on this fjord.