The Duchess
- taona: 2008
- Firenena: France, Italy, United Kingdom
- Genre: Drama, History, Romance
- Studio: Pathé Renn Productions, BBC Film, BIM Distribuzione, Qwerty Films, Magnolia Mae Films
- Keyword: adultery, infidelity, london, england, husband wife relationship, politics, marriage crisis, gambling debt, duke, biography, based on true story, unfaithfulness, royalty, historical fiction, period drama, aristocrat, 18th century, duchess, costume drama, philanderer
- tale: Saul Dibb
- Cast: Keira Knightley, Ralph Fiennes, Charlotte Rampling, Dominic Cooper, Hayley Atwell, Simon McBurney