Führer was a title used by Adolf Hitler, leader of Nazi Germany. He was commonly referred to as "the Führer". (TV: Let's Kill Hitler, Lost in Time, Silver Nemesis)
On Azimuth, Kurt Schalk declared himself Führer of the Daleks. (AUDIO: Daleks Among Us)
Parallel universe
In the Germania codenamed beta alpha one five by the Council of Hitlers, Adolf Hitler was murdered cicra 1933 by Ernst Rohm, who took his place as Führer. After the formation of the Greater German Reich, Germania I avenged Hitler's death by executing Rohm and his followers and appointing another Hitler in place as Führer. (PROSE: Warlords of Utopia)