The lake Sigöldulón (Icelandic pronunciation: [ˈsɪːɣˌœltʏˌlouːn] ) is a reservoir in Iceland, also known as Krókslón [ˈkʰrouksˌlouːn]. Situated in the south of the country, not far from Landmannalaugar, it is one of the country's 20 largest lakes at 14 km.

Both the lake and the nearby power station (Sigölduvirkjun [ˈsɪːɣˌœltʏˌvɪr̥cʏn]) take their names from a tuff ridge at about 600 m above sea level where the river Tungnaá once passed through a canyon. Its waters now flow in tubes into the power station, constructed between 1973 and 1977.

• List of lakes of Iceland
• List of rivers of Iceland