Sørfjorden is a 38-kilometre (24 mi) long fjord that is one of the innermost branches of the main Hardangerfjorden.

It is located in Ullensvang Municipality in Vestland county, Norway.

Sørfjorden stretches from just north of the village of Kinsarvik straight south to the industrial town of Odda.

[1] Some of the notable villages that line the sides of the fjord include (north to south): Kinsarvik, Lofthus, Vikebygd, Tyssedal, Eitrheim, and Odda.

Norwegian National Road 13 follows the eastern shoreline of the fjord.