Ernst Georg Ferdinand Küster (2 November 1839 – 19 April 1930) was a German surgeon born in Wollin. He studied medicine in Bonn, Würzburg and Berlin, and following graduation worked as an assistant to Robert Ferdinand Wilms (1824–1880) at the Bethanien Hospital in Berlin. In 1875, he became habilitated for surgery, and from 1879 was chief physician and an associate professor at Berlin's Augusta Hospital. In 1890 he was appointed professor of surgery at the University of Marburg, later returning as a surgeon to Berlin (1907).