"Green Leaves", also known as the Koontz House or the Beltzhoover House, is a Greek Revival mansion in Natchez, Mississippi, completed in 1838 by Edward P. Fourniquet, a French lawyer who built other structures in the area. It was purchased by George Washington Koontz, a local banker in 1849 and has been owned by his descendants ever since. It was listed on the National Register of Historic Places (NRHP) in 1979.