General administrator of the Comédie-Française from 1959 to 1960, he also was Yves Bréart de Boisanger's brother.
He was a member of the Conciliation Commission for Palestine in 1949 and in charge of American affairs in 1951, before he was promoted to the post of Ambassador of France in Czechoslovakia from 1953 to 1959.
Claude de Boisanger was general administrator of the Comédie-Française from April 1959 to January 1960.
His appointment was very unpopular with the world of theater and André Malraux finally terminated his functions.
Boisanger, who committed no misconduct, seized the Conseil d'État which canceled the decree for abuse of power.