Siegfried Wischnewski (15 April 1922 – 24 January 1989) was a German stage and film actor.
Wischnewski was born in the Masurian village of Saborowen, then in German East Prussia (today Zaborowo, Poland) to a peasant labourer.
He decided to become an actor after he appeared at a school theater, but was conscripted into Nazi Germany's Kriegsmarine after he had passed his Abitur at the Arndt-Gymnasium at Berlin-Dahlem in 1940.
He played several roles in popular TV-productions like The Squeaker, Tatort, Derrick or Der Kommissar but also in movie versions of Brecht's Dreigroschenoper (1962) or the Nibelungen (1966–67).
Probably his most significant success was the role of a veterinary in the 1980s TV-production Ein Heim für Tiere.