Ernst Georg Ferdinand Küster

Ernst Georg Ferdinand Küster (2 November 1839 – 19 April 1930) was a German surgeon born in Wollin.

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).

He is credited for developing the foundation of modern radical mastoidectomy for treatment of chronic ear disease.

Küster's radical mastoid operation is described as an extension of the simple mastoidectomy introduced by otologist Hermann Schwartze (1837–1910).