Walter Harold Nagle [Lucky] (March 10, 1880 – May 26, 1971) was a pitcher in Major League Baseball who played for the Pittsburgh Pirates and Boston Red Sox during the 1911 season. Listed at 6 ft 0 in (1.83 m), 176 lb., Nagle batted and threw right-handed. He was born in Santa Rosa, California. In one season career, Nagle posted a 5–3 record with a 3.48 ERA in 13 appearances, including four starts, one complete game, one save, 23 strikeouts, 12 walks, 60 hits allowed, and 54⅓ innings of work. He later was player/manager of the San Jose Bears in the California State League in 1913.