Susannah is an opera in two acts by the American composer Carlisle Floyd, who wrote the libretto and music while a member of the piano faculty at Florida State University. Floyd adapted the story from the Apocryphal tale of Susannah and the Elders, though the latter story has a more positive ending. The story focuses on 18-year-old Susannah Polk, an innocent girl who is targeted as a sinner in the small mountain town of New Hope Valley, in the Southern American state of Tennessee.

Carlisle Sessions Floyd was an American composer primarily known for his operas. These stage works, for which he wrote not only the music but also the librettos, typically engage with themes from the American South, particularly the Post-civil war South, the Great Depression and rural life. His best known opera, Susannah, is based on a story from the Biblical Apocrypha, transferred to contemporary rural Tennessee, and written for a Southern dialect. It was premiered at Florida State University in 1955, with Phyllis Curtin in the title role. When it was staged at the New York City Opera the following year, the reception was initially mixed; some considered it a masterpiece, while others degraded it as a 'folk opera'. Subsequent performances led to an increase in Susannah's reputation and the opera quickly became among the most performed of American operas.