Hans Adalbert Schlettow was a German film actor. Schlettow appeared in around a hundred and sixty films during his career, the majority during the silent era. Among his best-known film roles was Hagen von Tronje in Fritz Lang's film classic Die Nibelungen (1924). In 1929 he starred in the British director Anthony Asquith's film A Cottage on Dartmoor.

Die Nibelungen is a two-part German series of silent fantasy films created by Austrian director Fritz Lang in 1924, consisting of Die Nibelungen: Siegfried and Die Nibelungen: Kriemhild's Revenge.