Juvatn or Gjuvvatnet is a lake in the municipality of Åseral in Agder county, Norway.

The 8.06-square-kilometre (3.11 sq mi) lake lies on the river Logna in the upper part of the Mandalen valley.

The Bortelid ski area lies just west of the lake.

The dam was built in 1958 as part of the Logna power system.

The nearby lake Gyvatn lies about 8 kilometres (5.0 mi) southeast of Juvatn.