Julien Behr was born in Lyon. He was awarded the "singers' revelation of the year" in 2009 by the French musicians' association ADAMI and was among the 3 nominees in the category "singer's revelation of the year" at the Victoires de la musique classique in 2013. He entered the Boys' Choir of the Lyon Cathedral when he was six. He graduated from Lyon University with a Master degree in business law. He however abandoned his plans to become a lawyer in order to devote himself completely to music. In 2010, he graduated from his vocal studies at the Conservatoire National Supérieur de Musique in Lyon.
His passion for the theatre - he has played theatre since his early childhood - logically led him to the opera. 2009 was highlighted by his debut at the Festival d'Aix-en-Provence in Offenbach's Orphée aux Enfers. Soon Tamino (Die Zauberflöte) became the central role of his repertoire. He has performed this role in St Gallen, Bern, Rouen, Bordeaux, at the Opéra de Paris and at the Minnesota Opera for his US debut. In 2019 he came back to the USA performing Tamino at the Mostly Mozart Festival in New York. He has also performed, among others, at the Festival d'Aix-en-Provence and La Fenice in Venise (Aci in Aci and Galatea), the Opéra de Paris (Arsace in Bérénice, world premiere by Michael Jarrell), the Théâtre des Champs-Elysées, the Grand Théâtre in Luxembourg, the Opéra national de Lorraine (Don Ottavio in Don Giovanni), the Opéra Comique (Antonin in Ciboulette, Laërte in Hamlet), the Lyon Opera (Arbace in Idomeneo, Admeto in Alceste), the Avignon Opera (Camille de Rossillon in La veuve joyeuse), the Opéra national de Lorraine (Ferrando in Così fan tutte), the Opéra national du Rhin (world premiere of Quai Ouest by Régis Campo, Narraboth in Salomé), the Rennes Opera (Ernesto in Don Pasquale), the Nice Opera (Tom Rakewell in The Rake's Progress), the Bordeaux Opera (Edgardo in Lucia di Lammermoor), the Vlaams Opera (Fenton in Falstaff), the Cologne Opera (Don Ottavio in Don Giovanni, Gonzalve in L'heure espagnole), the Wiener Festwochen (Jaquino in Fidelio), the Mozartwoche Salzburg, the Theater an der Wien, at the Mostly Mozart Festival in New York (Arbace in Idomeneo) and at the Barbican Centre in London (Gonzalve in L'heure espagnole).
The 2019/20's season will be highlighted by appearances at the Grand Théâtre de Genève (role debut as Belmonte in Die Entführung aus dem Serail), the Opéra de Paris (Prince Philippe in Yvonne, Princesse de Bourgogne by Philippe Boesmans) and at the Lyon Opera (Shirine, world premiere by Thierry Escaich).
In concert, he has collaborated with orchestras such as Les Musiciens du Louvre, Les Siècles, the Ensemble Matheus, the Orchestre national de Lyon, the Orchestre national de Lille, the Orchestre national des Pays de la Loire, the BBC Symphony Orchestra in London, the Mozarteum Orchestra in Salzburg, the Akademie für Alte Musik Berlin, the Münchner Rundfunkorchester, the Orchestre de la Suisse Romande and with conductors such as Alain Altinoglu, Jean-Claude Casadesus, Charles Dutoit, Laurence Equilbey, Asher Fisch, René Jacobs, Louis Langrée, Marc Minkowski, Raphaël Pichon, Josep Pons, Jérémie Rhorer, François-Xavier Roth, Sébastien Rouland, Leonard Slatkin, Jean-Christophe Spinosi, Nathalie Stutzmann.
His discography includes Pergolesi's Septem verba a Christo (Harmonia Mundi, 2012) as well as Mélodies by Charles Koechlin (Timpani records, 2015) and L'heure espagnole (BR Media 2017). The production of Ciboulette at the Opéra Comique has been released on DVD. His first solo album, "Confidence", recorded with the Orchester of the Opéra de Lyon (Pierre Bleuse conducting), was released in 2018 under the label Alpha Classics and has been awarded a "Diapason d'or" as well as a "Qobuzissime".