Mary Rogers Williams (September 30, 1857 – September 17, 1907) was an American tonalist and Impressionist artist known for pastel and oil portraits and landscapes. She was second in command of Smith College's art department from 1888 to 1906 under Dwight William Tryon and earned acclaim for paintings of her native New England and scenes from her wide travels in Europe, from Norway to the Paestum ruins south of Naples. She often depicted high horizons, whether in meadows or medieval hill towns, under ribbons of sky.