Thaïs is an opera, entitled 'comédie lyrique' in three acts and seven tableaux, by Jules Massenet to a French libretto by Louis Gallet, based on the novel Thaïs by Anatole France. It was first performed at the Opéra Garnier in Paris on 16 March 1894, starring the American soprano Sibyl Sanderson, for whom Massenet had written the title role. The opera was later revised by the composer and was premiered at the same opera house of the original version on 13 April 1898.