Maid Lena (Danish: Jomfru Lene af Søndervand; German: Jungfer Lene von Söndervand; English: "Maiden Lene from Sondervand") is a Danish folktale collected by author Svend Grundtvig. It features versions of the swan maiden, a mythic female character that alternates between human and animal shapes.
The story is classified in the international Aarne-Thompson-Uther Index as tale type ATU 400, "The Man on a Quest for the Lost Wife", in a form of the narrative that, according to scholars, appears in Northern Europe, namely, in Scandinavia and in the Baltic Sea.