Johann Niemann, German lieutenant (d. 1943)
Johann Niemann (4 August 1913 – 14 October 1943) was a German SS and Holocaust perpetrator who was deputy commandant of Sobibor extermination camp during Operation Reinhard. He also served as a Leichenverbrenner (corpse cremator) at Grafeneck, Brandenburg, and Bernburg during the Aktion T4, the SS "euthanasia" program. Niemann was killed during the Sobibor prisoner uprising in 1943.