Saint-Ouen Abbey Church, also referred in English as Saint-Owen Abbey Church, is a large Gothic Roman Catholic church in Rouen, Normandy, France, famous for both its architecture and its large, unaltered Cavaillé-Coll organ, which Charles-Marie Widor described as "a Michelangelo of an organ". Built on a similar scale to nearby Rouen Cathedral, it is, along with church of Saint Maclou, one of the principal Gothic monuments of Rouen.