Le flibustier is a comédie lyrique in three acts, composed by César Cui during 1888–1889. Although the title can translate as The Pirate or The Buccaneer, this is no swashbuckling action-drama, but an idyllic domestic comedy of mistaken identity.

César Antonovich Cui was a Russian composer and music critic, member of the Belyayev circle and The Five – a group of composers combined by the idea of creating a specifically Russian type of music. As an officer of the Imperial Russian Army, he rose to the rank of Engineer-General, taught fortifications in Russian military academies and wrote a number of monographs on the subject.