Lycksjön is a lake in Stockholm County, Södermanland, Sweden. It lies inside the Tyresta National Park.

Lycksjön
View of lake
Location of lake
Location of lake
Lycksjön
Coordinates59°11′01″N 18°12′40″E / 59.18361°N 18.21111°E / 59.18361; 18.21111
Basin countriesSweden