After a season marked by two European tours under the direction of René Jacobs, during which he sang the roles of Pastore (L'Orfeo) with the Freiburger Barockorchester and Remendado (Carmen), alongside the ensemble B'Rock, in venues including the Philharmonias of Paris, Berlin and Hamburg, as well as the Teatro Real in Madrid and the Liceu in Barcelona, Grégoire Mour sang Spoletta (Tosca) at the Opéra de Dijon; this season he is Brighella and Tanzmeister (Ariadne auf Naxos) at the Opéra de Rouen, and sings Saint-Saëns's Christmas Oratorio with the Orchestre national des Pays de la Loire.

He has recently been heard as Gonzalve (L'Heure Espagnole) at the Opéra de Toulon, Normanno (Lucia di Lamermoor) at the Opéra de Nice, Gastone (La Traviata) at the Opéra de Lorraine and as the 4th Jew (Salomé) at the Aix-en-Provence Festival, Premier Commissaire (Dialogues des Carmélites) at the Opéra de Massy and as tenor soloist in Mozart's Requiem with the Radio-France Choir, then with the Orchestre national des Pays de la Loire.

As a member of the Studio de l'Opéra de Lyon between 2017 and 2019, he performed the roles of Uldino (Attila) and Abdallo (Nabucco) under the direction of Daniele Rustioni at the Opéra de Lyon and at the Théâtre des Champs-Élysées, the roles of the Prince and the Jester (Respighi's Sleeping Beauty) under the direction of Philippe Forget, and Torquemada (Ravel's L'Heure Espagnole) under the direction of Jonathan Stockhammer; He has also recently performed the roles of Borsa (Rigoletto), Rodolphe (Guillaume Tell), Maréchal Trac (Le Roi Carotte by Offenbach) and the Young Prisoner (From the House of the Dead by Leos Janácek). Grégoire Mour is a graduate of the Conservatoire National Supérieur de Musique et de Danse in Paris and the Guildhall School of Music and Drama in London, having trained as a dancer at the Conservatoire de Lyon. He also studied drama at the Cours Florent in Paris.

As a laureate of the Royaumont Foundation (2019/2020), Grégoire Mour worked with directors Moshe Leiser and Patrice Caurier on Rossini's operas, a repertoire in which he is particularly comfortable with; he also took part in a tribute concert to the composer with the Lyon Opera Orchestra conducted by Daniele Rustioni, and sang the solo tenor part of the Stabat Mater at the Grand Amphithéâtre de la Sorbonne.

A laureate of the Académie de la voix 2020 at the Fondation des Treilles, he received advice from soprano Annick Massis, directors Ivan Alexandre, Alain Perroux and Julien Benhamou.

Also interested in the musical repertoire, he performed the role of Uncle Ian in the world premiere of Bernardo's Pourquoi j'ai mangé mon père?, Bernstein's West Side Story at the Théâtre du Châtelet with the English company Vivo d'Arte, and the title role of Gershwin in a show based on the composer's music.
He was heard at the Barbican Hall in London in the opera Alice in Wonderland (Unsuk Chin) with the BBC Symphony Orchestra, then as an Elder Brother in The Hogboon, a creation by Sir Peter Maxwell Davies with the London Symphony Orchestra and Sir Simon Rattle.

Grégoire Mour has been represented by RSB Artists since 2019.