Ralph Ward Stackpole (May 1, 1885 – December 13, 1973) was an American sculptor, painter, muralist, etcher and art educator, San Francisco's leading artist during the 1920s and 1930s. Stackpole was involved in the art and causes of social realism, especially during the Great Depression, when he was part of the Public Works of Art Project, Federal Art Project of the Works Progress Administration, and the Treasury Department's Section of Painting and Sculpture.