Sperillen is a lake in the valley of Ådal in Ringerike municipality, Buskerud county, Norway.

At the southern end, Ådal river flows downstream from Sperillen.

[1][2] [3] [4] The name Sperillen is derived from the Old Norse Sperðill which means "tail" and may refer to the elongated form of the lake.

[5] Common species are whitefish, char, European perch and trout, as well as crayfish.

From 1868 to 1929, transport along the lake was principally supplied by a small steamship, DS Bægna, which ran from the terminus of the Sperillen Line at Finsand on the southern end of the lake to Nes at the northern end.