Life and career
Duval attended the Collège de
Libourne, appearing in the play Les Plus beaux yeux du monde by
Jean Sarment. Her father, a colonel, allowed her to enrol in the theatre classes at the
Conservatoire de Bordeaux, where she was spotted by the director,
Gaston Poulet, who got her into the vocal classes.
 From there she made her debut in
Cavalleria rusticana at the
Grand Theatre de Bordeaux in 1942, her Santuzza described by the Liberté du Sud-Ouest critic as “painful, fierce, tragic”, leading to other principal roles in Bordeaux.
In Paris she was disappointed at her audition at the Opéra, but was soon engaged at the
Folies-Bergère, and sang in the clothed revue, gaining more stage experience; she later commented "Aux Folies, j'ai tout appris!".
 At her second try for an operatic position Duval was engaged for
L'Aiglon (which she never sang), but made her debut at the
Opéra-Comique in the title role of
Madame Butterfly on 5 March 1947.
 The same year she was discovered by Poulenc, rehearsing Cio-Cio-san the composer immediately recognizing her as the artist he was seeking for his first opera Les Mamelles de Tirésias that June; she worked closely with Poulenc for the rest of his life.
Paul Payen and Denise Duval in Les Mamelles de Tirésias
, Paris, 1947
Her repertoire at the Salle Favart went on over 20 years to cover the title role in Angélique, la Périchole in le Carrosse du Saint-Sacrement, Giulietta in
les Contes d’Hoffmann, Concepción in
L'Heure espagnole, Alexina in
Le Roi malgré lui,
la Bohème (Musette), Madame Bovary (Emma),
Pelléas et Mélisande (Mélisande). She also created the roles of Thérèse in
les Mamelles de Tirésias, Francesca in le Oui des Jeunes Filles, Valentine in ll était un Petit Navire, and the title role in Dolorès.
 She sang Madame Fabien in the French premiere of Vol de nuit (Volo di notte) by Luigi Dallapiccola in 1960.
At the Paris Opéra she sang Salomé in 1947 and followed this with
Thaïs, Rosenn in
Le Roi d'Ys, Portia in Le Marchand de Venise and Les Indes Galantes
Outside France Duval sang in Italy (la Scala), the Edinburgh Festival, The Colon in Buenos-Aires
 At Monte Carlo her roles also included Fata Morgana in The Love for three oranges, Musetta in La Bohème and The Medium. Among her appearances in America was her 1961 Thaïs at the
Dallas Opera, conducted by
Nicola Rescigno and directed by
Franco Zeffirelli. She sang La femme and Concepción in the first and third parts of a triple bill of Vol de nuit,
Le Rossignol and L'Heure espagnole in Brussels.
Poulenc wrote his La Courte Paille song cycle (poems by Maurice Carême) for Duval - or rather "for her to sing to her six-year-old son" (although she did not premiere it)
 and later for her also La Dame de Monte-Carlo, in 1961.
Following incorrect administration of cortisone treatment she retired in 1965 from performance and moved to the home her husband had built in Switzerland, while retaining some teaching at the École française de musique.
Grove describes her as a “beautiful woman with great dramatic intelligence, she was a most gifted singing actress”.
In 2003 a biography by Bruno Bérenguer, Denise Duval, was published by Symétrie.