Mary Agnes Yerkes, (/ˈjɜːrkiːz/ YUR-keez; August 9, 1886 – November 8, 1989), was an American Impressionist painter, photographer and artisan. She was skilled in the media of oil, pastel and watercolor. Her professional career was cut short by the Great Depression, but she still continued to paint well into her nineties with a passion for her craft and nature. She is noted for her plein-air painting while camping the American West and its National Parks.