Henry Francis O'Day (July 8, 1862 July 2, 1935) was an American right-handed pitcher, umpire and manager in Major League Baseball who worked as a National League (NL) umpire for 30 years between 1895 and 1927, and was the only person in major league history to appear as a player, manager and umpire. His 3,986 total games as an official ranked third in major league history when he retired, and his 2,710 games as a plate umpire still rank second in major league history to Bill Klem's total of 3,543. O'Day also umpired in 10 World Series second only to Klem's total of 18 including five of the first seven played. He is largely known for his controversial decision in a pivotal 1908 game, a ruling which still causes debate today. O'Day was born in Chicago, Illinois, one of six children of two deaf parents. He made his debut as a major league player with the Toledo Blue Stockings in 1884, and in his seven-year career he posted a record of 73110.
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