Qeqertarsuaq is a port and town in Qeqertalik municipality, located on the south coast of Disko Island on the west coast of Greenland. Founded in 1773, the town is now home to a campus of the University of Copenhagen known as Arctic Station. Qeqertarsuaq is the Kalaallisut name for Disko Island and is also now used for several other islands on Greenland, including those formerly known as Upernavik and Herbert Island. Qeqertarsuaq means 'the big island' in Kalaallisut.

Qeqertalik is a municipality of Greenland created in 2018 from four southern regions of the former Qaasuitsup Municipality. It is the least populated municipality at a population of 6,340, despite this it is the 2nd most densely populated municipality with 0.11 people per square kilometer.