Régine Crespin, (born Feb. 23, 1927, Marseilles, France—died July 5, 2007, Paris, France), French opera singer who was known for the warmth and strength of her voice and the subtlety of her interpretation in a variety of soprano roles. She was particularly associated with the operas of Richard Wagner and Richard Strauss, and the Marschallin in Strauss’s Der Rosenkavalier became a signature role for her, both in French translation and later in German. Crespin made her professional debut (1950) as Elsa in a French-language production of Wagner’s Lohengrin. In 1957 she portrayed Madame Lidoine, the new prioress, in the Paris premiere of Francis Poulenc’s Les Dialogues des Carmélites. The next year she sang her first German-language role, Kundry, in Wagner’s Parsival at the Bayreuth Festival. When health problems in the early 1970s affected Crespin’s vocal range, she retrained her voice as a mezzo-soprano. Her greatest role during this later phase of her career was Madame de Croissy, the old prioress, in Les Dialogues des Carmélites. Crespin was admitted to the Legion of Honour as a chevalier (1972) and advanced to officer (1982) and commander (1994).