Dennis Patrick Aloysius Lyons (March 12, 1866 – January 2, 1929) was an American Major League Baseball player. He played third base for the Providence Grays (1885), Philadelphia Athletics (1886–90), St. Louis Browns (1891), New York Giants (1892), Pittsburgh Pirates (1893–94 and 1896–97), and St. Louis Browns (1895). Lyons was born in Cincinnati. He reached base by a hit or a walk in 52 consecutive games in 1887. Lyons led the American Association in on-base percentage (.461), slugging percentage (.531) and OPS (.992) in 1890. He died in West Covington, Kentucky, at the age of 62.