Robert W. Williams Jr. (January 24, 1841 in Chambersburg, Pennsylvania – December 10, 1914 in Washington, D.C.) was an American archer who competed in the early twentieth century. He won two silver medals in Archery at the 1904 Summer Olympics in Missouri in the double york and American rounds. In the team competition he won the gold medal. Williams is probably the only U.S. Olympic competitor to have fought in the American Civil War, serving in the 54th Ohio Infantry Regiment as a colonel.