Outer Kitsissut (Danish: Ydre Kitsissut, old spelling Ydre Kitsigsut), also known as Thorstein Islands or Torstein Islands, is an island group in the Kujalleq municipality in southern Greenland.

Outer Kitsissut is located 9.5 kilometres (6 miles) to the west-north-west of Cape Desolation 5 km from the shore. It is a compact cluster of small islets and rocks, with a length of 10 km and a width of 5 km. The highest and largest islet is Thorstein Island in the centre of the group, having a maximum length of about 0.7 km with a maximum height of 116 m.

The Inner Kitsissut group lies 4 km to the northeast of the northern end of the cluster at the mouth of the Coppermine Bay.

• List of islands of Greenland

• Torstein Islands (Ydre Kitsissut) / Kujalleq