Sermitsiaq, Mountain summit in Sermersooq, Greenland.

Sermitsiaq is a 1,210-metre mountain in the centre of its namesake island in the Nuup Kangerlua fjord, 15 km northeast of Nuuk. Its summit is crowned by a sharp west–east ridge from which three summit points emerge, resembling a saddle. The south side is shaped by steep rock formations, while the north side is covered with glaciers.

The mountain gave both the island and the Danish name Sadelø, meaning saddle, to the feature whose three summit points on a west–east ridge resemble a saddle when seen from Nuuk. Greenland's national newspaper Sermitsiaq, one of the country's two national papers, is named after the 1,210-metre mountain.

The mountain's outline appears on Nuuk's official emblem and inspired the name of a major national newspaper. This landmark carries deep meaning for the city and represents local pride.

Sermitsiaq lies on its own island in Nuup Kangerlua, 13–15 km northeast of Nuuk, so it is reached by boat across the fjord rather than on foot from the city. The south side is steep rock and the north side carries glaciers, so plan for cold, changeable conditions and a landing on rough shore. The waterfall on the mountain is the feature most visitors come to see.

Sermitsiaq's Greenlandic name means "eternal ice", while the Danish name Sadelø refers to the saddle shape formed by three summit points on a sharp west–east ridge. The mountain gave its name to Sermitsiaq, one of Greenland's two national newspapers.