Naughty Marietta is a 1935 American romantic musical film based on the 1910 operetta of the same name by Victor Herbert. Jeanette MacDonald stars as a princess who flees an arranged marriage. She sails for New Orleans and is rescued from pirates by Captain Richard Warrington. Five of Herbert's most famous songs come from the score of Naughty Marietta, with words by lyricist Rida Johnson Young: "Ah! Sweet Mystery of Life", "Italian Street Song", "Neath the Southern Moon", "I'm Falling in Love with Someone" and "Tramp! Tramp! Tramp! ". Additional lyrics for several of Herbert's songs were penned for the film by Gus Kahn. The film was written by Frances Goodrich, Albert Hackett, John Lee Mahin and Rida Johnson Young.

Naughty Marietta is an operetta in two acts, with libretto by Rida Johnson Young and music by Victor Herbert. Set in New Orleans in 1780, it tells how Captain Richard Warrington is commissioned to unmask and capture a notorious French pirate calling himself "Bras Pique" – and how he is helped and hindered by a high-spirited runaway, Contessa Marietta. The score includes many well-known songs, including "Ah! Sweet Mystery of Life".