Madewood Plantation House, also known as Madewood, is a former sugarcane plantation house on Bayou Lafourche, near Napoleonville, Louisiana. It is located approximately two miles east of Napoleonville on Louisiana Highway 308. A National Historic Landmark, the 1846 house is architecturally significant as the first major work of Henry Howard, and as one of the finest Greek Revival plantation houses in the American South.

Henry Howard (1818–1884) was an Irish-born American architect. Over the course of four decades, he designed over 280 buildings in Louisiana, including several plantation houses during the antebellum era. After the Civil War, he designed many town houses in New Orleans.