Ruth Elfriede Hildner (1 November 1919 – 2 May 1947) was a guard at several Nazi concentration camps during World War II. Hildner was conscripted into camp service in July 1944, arriving at Ravensbrück concentration camp to be trained as a camp matron. Hildner, just 24 years old, entered the Dachau concentration camp in September 1944 as an Aufseherin. Next she was sent to an Agfa Camera-werke-connected subcamp at Munich; she eventually served in several subcamps, including Hennigsdorf, Wittenberg and Haselhorst. In December 1944, she arrived at Helmbrechts, a tiny subcamp of Flossenbürg located near Hof, Germany. There, she was feared by the camp's inmates, both Jews and non-Jews.