Leo Allan Mangum (May 24, 1896 – July 9, 1974) was a professional baseball pitcher. He played all or part of seven seasons in Major League Baseball between 1924 and 1935 with the Chicago White Sox, New York Giants, and Boston Braves. He had a record of 11–10 in his career, pitching mostly in relief.
Mangum died of a stroke on July 9, 1974.

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