Quadrille is a play by Noël Coward. It is a romantic comedy set in the mid-Victorian era, and depicts the romantic permutations when an English aristocrat elopes with the wife of an American businessman and the American falls in love with the aristocrat's deserted wife.
The play premiered in London in 1952, starring Lynn Fontanne and Alfred Lunt. It played on Broadway in 1955, with the same two players in the lead roles.