Zoltán Kelemen (March 12, 1926 – May 9, 1979) was a Hungarian bass-baritone. He was born in Budapest and died in Zurich. He began studying music at the Franz Liszt Academy of Music before leaving Hungary in order to study in Rome. When he left Rome in 1959, he established himself in Germany, first in Augsburg and later in Cologne.
In the late 1960s and early 1970s, Kelemen was a favorite singer of Herbert von Karajan, with whom he recorded Fidelio in the role of Don Pizarro, Der Ring des Nibelungen as Alberich, Boris Godunov as Rangoni, Die Meistersinger von Nürnberg as Fritz Kothner, The Merry Widow as Mirko Zeta, and others. Kelemen also recorded the role of Klingsor in Parsifal with Georg Solti (1971). At the Bayreuth Festival, Kelemen succeeded Gustav Neidlinger in the role of Alberich, in which he debuted in 1962 and with which he became identified. He notably sang it several times under the direction of Pierre Boulez.