Sakskøbing is a town with a population of 4,519 (1 January 2015) and a former municipality (Danish, kommune) in Guldborgsund municipality in Region Sjælland on the northeast coast of the island of Lolland in south Denmark. The former Sakskøbing municipality, including the small island of Vigsø, covered an area of 176 km², and had a total population of 9,299 (2005). Its last mayor was Kaj Petersen a member of the Social Democrats (Socialdemokraterne) political party.