William Brown Foley (November 15, 1855 – November 12, 1916) was a Major League Baseball third baseman. He played all or part of seven seasons in the majors, playing for five different teams in three different leagues. His career began in the National Association in 1875 with the Chicago White Stockings, and ended in the Union Association in 1884 with the Chicago Browns/Pittsburgh Stogies. From 1876 until 1879, he was the starting third baseman for the Cincinnati Reds and Milwaukee Grays.