Paatusoq, mentioned as 'Patursok' by Wilhelm August Graah,[1] is a fjord in the King Frederick VI Coast, Kujalleq municipality, southeastern Greenland.

To the east the fjord opens into the North Atlantic Ocean 10 km (6.2 mi) southwest of Cape Discord.

[4] Paatusoq has a short branch midway into its southern shore at about 23 km (14 mi) from the fjord's mouth with a glacier reaching down to the waterline.

In the western part of Paatusoq the mountain ranges on both sides of the fjord rise steeply from the shore to heights of about 2,000 m (6,600 ft).

The massive succession of mountains on the northern side culminates in Mount Paatusoq (Patuersoq), a magnificent ultra-prominent peak at 60°52′55″N 43°44′56″W / 60.88194°N 43.74889°W / 60.88194; -43.74889 towering to a height of 2,488 m (8,163 ft) above the glacier at the head of the fjord.