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Leslie Mann (November 18, 1892 – January 14, 1962) was an American athlete and sports administrator. During his playing career, he played college football and professional baseball, and went on to coach football, baseball, and basketball.
Mann played in Major League Baseball (MLB) as an outfielder from 1913 to 1928 for seven teams, spending eight years of his career with the Boston Braves. After his playing career, Mann became a tireless promoter of amateur baseball. He founded the International Baseball Federation (IBF), helped bring baseball to the 1936 Berlin Olympics, and coached the United States national team at the inaugural 1938 Amateur World Series. His efforts to further internationalize the game were derailed by World War II.
Mann was the head basketball coach at Rice Institute (1919–1920), Indiana University (1922–1924), and Springfield College (1924–1926). He compiled a career record of 43–30 in five seasons as a head basketball coach.