Gunnlaugsson is a surname of Icelandic origin, meaning son of Gunnlaugur. In Icelandic names, the name is not strictly a surname, but a patronymic.
People named Gunnlaugsson include:
Arnar Gunnlaugsson (born 1973), Icelandic professional football player Bjarki Gunnlaugsson (born 1973), Icelandic professional football player Björn Gunnlaugsson (1788–1876), Icelandic mathematician and cartographer Darryl Gunnlaugson, Canadian curler Eyþór Ingi Gunnlaugsson (born 1989), Icelandic singer Garðar Gunnlaugsson (born 1983), Icelandic professional football player Hrafn Gunnlaugsson (born 1948), Icelandic filmmaker of Viking films Sigmundur Davíð Gunnlaugsson (born 1975), Icelandic politician, former Prime Minister