Claude Helffer (June 18, 1922 – October 27, 2004) was a French pianist noted particularly for his advocacy of 20th-century music. 　　He was born in Paris, and began piano lessons at the age of five and from the age of ten until the outbreak of World War II he studied with Robert Casadesus. During the War he entered the elite Ecole polytechnique and fought for the Resistance (in the Maquis du Vercors). After the War he studied theory and composition with Rene Leibowitz. He made his debut in Paris in 1948 and from 1954 appeared regularly in the concerts of the Domaine musical. He married the noted ethnomusicologist, Mireille Helffer, whom he met at the Lycee Moliere two years earlier, in June 1946. 　　Helffer gave many premieres of new works and was the dedicatee of several notable works, including Erikhthon (Xenakis, 1974), Concerto (Boucourechliev, 1975), Stances (Betsy Jolas, 1978), Concerto no. 1 (Luis de Pablo, 1980), Envoi (Gilles Tremblay, 1982), and Modifications (Michael Jarrell, 1983). Conductors he collaborated with included Boulez, Bour, Gielen, Leibowitz, Maderna, Marriner, Martinon, Van Otterloo, Prêtre and Scherchen. His discography includes the complete piano music of Schoenberg (Grand Prix du Disque), Debussy and Ravel and the Sonatas of Boulez, Berg and Barraque.