Joseph Jerome McGinnity (March 20, 1871 – November 14, 1929) was an American right-handed pitcher in Major League Baseball (MLB) in the late 19th and early 20th century. McGinnity played in MLB for ten years, pitching for the National League's (NL) Baltimore Orioles (1899) and Brooklyn Superbas (1900), before jumping to the American League (AL) to play for the Baltimore Orioles (AL) (1901–1902). He returned to the NL with the New York Giants (1902–1908). McGinnity continued to pitch in the minor leagues, eventually retiring from baseball for good at the age of 54.

In MLB, he won 246 games with a 2.66 earned run average (ERA). He had seven 20-win seasons and two 30-win seasons. Including his time in the minor leagues, McGinnity won close to 500 games as a professional ballplayer. He led MLB in wins five times (1899, 1900, 1903, 1904, and 1906) and ERA once (1904). With the Giants, he won the 1905 World Series. His teams also won NL pennants in 1900 and 1904.

McGinnity was nicknamed "Iron Man" because he worked in an iron foundry during the baseball offseasons. His nickname came to convey his longevity and durability, as he routinely pitched in both games of doubleheaders. He set NL records for complete games (48) and innings pitched (434) in a single season, which still stand. McGinnity is considered one of the better players in the history of the New York Giants. The Veterans Committee elected him to the National Baseball Hall of Fame in 1946.

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