William Michael Joyce (September 22, 1867 – May 8, 1941) was an American professional baseball player and manager. He was a third baseman over parts of eight seasons with the Brooklyn Ward's Wonders (of the Players' League), Boston Reds (of the American Association), Brooklyn Grooms, Washington Senators, and New York Giants. He also served as manager during his tenure with the Giants. After retiring in December 1899, Joyce held many jobs, including saloonkeeper, minor league owner and manager, professional baseball scout, security guard, and municipal smoke inspector. He married in 1908.