Morsø municipality is a municipality (Danish, kommune) in Region Nordjylland in northern Denmark. The municipality is located on the island of Morsø or Mors, an island in the Limfjord, the sound that separates the island of Vendsyssel-Thy from the rest of Jutland Peninsula. The municipality includes the smaller island of Agerø, and covers an area of 368 km². It has a total population of 22,091 (2008).