Herta Oberheuser (15 May 1911 – 24 January 1978) was a German Nazi physician and convicted war criminal who performed medical atrocities on prisoners at the Ravensbrück women's concentration camp. She was sentenced to 20 years' imprisonment at the Nuremberg Doctors' trial, but served only five. A survivor of Ravensbrück termed her, "a beast masquerading as a human".