Clarence William "Tilly" Walker (September 4, 1887 – September 21, 1959) was an American professional baseball player. After growing up in Limestone, Tennessee, and attending college locally at Washington College, he entered Major League Baseball (MLB). He was a left fielder and center fielder for the Washington Senators, St. Louis Browns, Boston Red Sox and Philadelphia Athletics from 1911 to 1923. In 1918, he tied Babe Ruth for the home run crown that season.