William Hoffman Keister (August 17, 1871 – August 19, 1924) was a professional baseball player who played infielder and outfielder in the Major Leagues from 1896 to 1903. He would play for the Baltimore Orioles (NL), Boston Beaneaters, St. Louis Cardinals, Baltimore Orioles (AL), Washington Senators, and Philadelphia Phillies. In the five full seasons that he played, each of the teams that Keister played for finished last in the league for double plays. In 621 games over seven seasons, Keister posted a .312 batting average (758-for-2433) with 400 runs, 133 doubles, 63 triples, 18 home runs, 400 RBI, 131 stolen bases, .349 on-base percentage and .440 slugging percentage.