于斯南河瑞典的河流，发源自海里耶达伦西北部，最终注入波的尼亚湾，河道全长430公里，流域面积19,828平方公里，平均流量每秒230立方米，支流有沃克斯南河。

Ljusnan (from Old Norse: Lusn — light) is a river in Sweden, which is 440 kilometers long. The river starts in northwestern Härjedalen and then continues throughout the province into Hälsingland all the way to the Bothnian Sea. The biggest tributary is Voxnan. The river is heavily used for hydropower with 18 hydro powerplants. During 2001 Ljusnan produced 4,5 TWh.