Saint-Yves (9 November 1808[1] – 23 July 1871[2]) was the pen name of Édouard Déaddé, a 19th-century French playwright.
He was born Ernest-Antoine-Edmond-Édouard Déaddé in Paris.
An employee at the Interior ministry, he became known as vaudevilliste under the pen name Saint-Yves and published numerous articles in the Revue et gazette musicale under the pseudonym D.A.D.
Several collaborative projects were discussed with Honoré de Balzac but none were realized.
[3] He was the managing director of the Théâtre de la Porte-Saint-Antoine from 31 December 1839 to January 1841.