Ernst Gräfenberg (September 26, 1881 in Adelebsen near Göttingen, Germany – 28 October 1957 in New York City, United States) was a German-born physician (medical doctor) and scientist.
He succeeded in 1407, together with the City of Göttingen 1407, to storm the castle at Jühnde, and he also forced the Lords of Adelebsen, Hardenberg and Schwicheldt to respect the peace.