Werther é uma ópera em quatro atos de Jules Massenet, com libreto francês de Édouard Blau, Paul Milliet e Georges Hartmann (que usou o pseudônimo de Henri Grémont), baseado em Os Sofrimentos do Jovem Werther, de Johann Wolfgang von Goethe, por sua vez baseado nos anos de juventude do próprio Goethe.

Werther is an opera (drame lyrique) in four acts by Jules Massenet to a French libretto by Édouard Blau, Paul Milliet and Georges Hartmann (who used the pseudonym Henri Grémont). It is loosely based on the German epistolary novel The Sorrows of Young Werther by Johann Wolfgang von Goethe, which was based both on fact and on Goethe’s own early life.