Glan (Swedish pronunciation: [ˈɡlɑːn])[1] is a lake in Sweden, located in the province of Östergötland, more specifically within the municipalities of Finspång and Norrköping.

The lake has a depth of 22.6 meters (74 ft) and its area is 73.2 square kilometres (28.3 sq mi).

Many species of fish[2] can be found in it, for instance perch, asp, blicca bjoerkna, common bream, zander, and northern pike.

A fact that distinguishes Glan is that during the summer the temperature at the bottom stays relatively high, around 14°C.

The lake is the main source of water for the city of Norrköping.