Robert William Vonnoh (September 17, 1858 – 28 December 1933) was an American Impressionist painter known for his portraits and landscapes. He travelled extensively between the American East Coast and France, more specifically the artists colony Grez-sur-Loing.
He studied in Boston at the Massachusetts Normal Art School now called Massachusetts College of Art and Design, then in Paris at the Académie Julian under Gustave Boulanger and Jules Joseph Lefebvre. He taught at the Massachusetts Normal Art School (1879-1881), at the Cowles Art School in Boston (1884–1885), at the School of the Museum of Fine Arts, Boston (1883–1887), and at the Pennsylvania Academy of the Fine Arts (1891–1896). Vonnoh became a member of the National Academy of Design in 1906.