István Kertész (28 August 1929 – 16 April 1973) was a Hungarian orchestral and operatic conductor who throughout his brief career led many of the world's great orchestras, including the Cleveland, Chicago, Philadelphia, New York, Los Angeles, Pittsburgh, Detroit, San Francisco and Minnesota Orchestras in the United States, as well as the London Symphony, Vienna Philharmonic, Berlin Philharmonic, Royal Concertgebouw Orchestra, Israel Philharmonic, and L'Orchestre de la Suisse Romande. His orchestral repertoire numbered over 450 works from all periods, and was matched by a repertoire of some sixty operas ranging from Mozart, Verdi, Puccini and Wagner to the more contemporary Prokofiev, Bartók, Britten, Kodály, Poulenc and Janáček.