The Smiling Lieutenant is a 1931 American Pre-Code musical comedy film directed by Ernst Lubitsch, starring Maurice Chevalier and Claudette Colbert, and released by Paramount Pictures. Made in the Pre-Code era, it was written by Samson Raphaelson and Ernest Vajda, from the operetta Ein Walzertraum by Oscar Straus, with libretto by Leopold Jacobson and Felix Dörmann, which in turn was based on the novel Nux, der Prinzgemahl ("Nux the Prince Consort") by Hans Müller-Einigen.