Judith Gauthier made her debut in Théâtre du Châtelet, Paris, performing in Campra's Idoménée and was invited to participate in 'Bastien und Bastienne'.

She sang Céphise in Lully's Alceste (Théâtre des Champs-Elysées, Paris), Arcas in Martin y Soler's Ifigenia in Aulide (Madrid), Frasquita in Carmen (Bremen Music Festival, M. Minkowski, conductor), Lisetta in Rossini's La Gazzetta (Bad Wildbad Belcanto Opera Festival).

Judith Gauthier has performed Oberto in Händel's Alcina (Opera National de Paris-Garnier, Wiener Konzerthaus, and Aix-en -Provence), Fiorilla in Rossini's Il Turco in Italia (Basel-Riehen), Hélène in Chabrier's L'éducation manquée (Caen), a recital at Festival de Musique Baroque de Lyon, Monteverdi's Vespro de la Beata Vergine and Drolla in Wagner's Die Feen (both at Théâtre du Châtelet, Paris).

Selected recordings include Frank Martin' s Golgotha and French Early Music works (both for for Harmonia Mundi), Lisetta in Rossini's La Gazzetta (for Naxos), among others.

More recently she has appeared as Astrée in G.Pesson's Pastorale (Châtelet, Paris), Amour and Clarine in Rameau's Platée (Bastille, Paris), and was a soloist in Mozart's Mass in C (Mozarteum, Salzburg), in a Vivaldi-Händel-Porpora program (Ensemble Matheus, Jean-Christophe Spinosi, conductor), and in J.S. Bach's Johannes Passion (Hamburg, Paris, Grenoble, Cuenca, and Krakow, Les Musiciens du Louvre, M. Minkowski, conductor).

Upcoming engagements include Schubert's Cantate for Choir and Soprano solo Mirjiams Siegesgesang (Paris, Cité de la Musique, Opéra de Rouen), Oberto in Händel's Alcina (Santiago de Chile), Bellezza in Händel's Il trionfo del tempo (Stuttgart), the title part in Massenet' Cendrillon (Paris, Opéra Comique), and Inès in Donizetti's La Favorite (Paris, Théâtre des Champs Elysées).