Paul Cornoyer was an American painter who worked in the Barbizon and Impressionist styles.

Born in St. Louis, he studied there at the St. Louis School of Art, as well as in Paris at the Académie Julian.

He spent much of his later career in New York, where he taught, and delighted in painting street scenes and parks — particularly in rain, snow and atmospherically muted conditions. He also spent time painting and teaching in East Gloucester, Massashusetts, where he had a summer home.