Karl Richard Freiherr Michel von Tüßling[lower-alpha 1] (27 July 1907 – 30 October 1991) was a German Schutzstaffel (SS) officer who served in the Nazi government of dictator Adolf Hitler, in the staff of the Reichsführer SS and in the staff of the SS Main Office. From 1936 onwards, he also was the personal adjutant of Reichsleiter and SS-Obergruppenführer Philipp Bouhler, who was in charge of Hitler's Chancellery (Kanzlei des Führers), head of the euthanasia programme Aktion T4, as well as co-initiator of Aktion 14f13.[1][2] In 1947 Tüßling provided an affidavit in defence of war criminal Viktor Brack who was sentenced to death at the Nuremberg trials.[3][4]