|Location||Halland County, Västra Götaland County, Sweden|
|Max. length||20 km (12 mi)|
|Max. width||2.5 km (1.6 mi)|
|Surface area||33 km2 (13 sq mi)|
|Max. depth||50 m (160 ft)|
|Surface elevation||15 m (49 ft)|
|Settlements||Fjärås kyrkby, Sätila|
Lygnern is a lake in the municipalities of Kungsbacka and Mark, western Sweden. With an area of 33 km², it is the largest lake in Halland County. Its main outflow is Rolfsån, which in turn empties out into the Kungsbacka Fjord.
The lake serves as a source of drinking water for Kungsbacka. In 2006, it was nominated as the cleanest lake in Sweden, as 98% of the surveyed residents of the municipality were satisfied with the water quality.
- "Lygnern" (in Swedish). Lygnerns Sportfiskeklubb. Retrieved 26 December 2010.
- "Lygnern". Nationalencyklopedin (in Swedish). Retrieved December 2010. Check date values in:
- "Välj kranvatten" (in Swedish). Kungsbacka Municipality. Archived from the original on 19 July 2011. Retrieved 26 December 2010.