Røst is a municipality in Nordland county, Norway. It is part of the Lofoten traditional region. The administrative centre of the municipality is the village of Røst. Røst was separated from the municipality of Værøy on 1 July 1928.
There are 365 islands and skerries in the municipality situated some 100 kilometres (62 mi) off the mainland, off the southwestern tip of the Lofoten chain. The municipality also has one of the biggest birdcliffs in the North Atlantic, with puffin colonies, as well as colonies of shag, kittiwake, and cormorants.The coat-of-arms is from modern times. They were granted on 28 November 1986. The arms show three cormorants, which play a role in a local legend, in which three brothers can transform themselves into cormorants.