Ærøskøbing Municipality is a former municipality (Danish, kommune) in Funen County on the island of Ærø in southern Denmark. Since 1 January 2006 it has been a part of Ærø Municipality  The municipality covered an area of 74 km², and had a total population of 3,731 (2005). Its last mayor was Jørgen Otto Jørgensen, a member of the Social Democrats (Socialdemokraterne) political party.