Leon Day (October 30, 1916 – March 13, 1995) was an American professional baseball pitcher who spent the majority of his career in the Negro leagues. Recognized as one of the most versatile athletes in the league during his prime, Day could play every position, with the exception of catcher, and often was the starting second baseman or center fielder when he was not on the mound. A right-handed pitcher with a trademark no wind-up delivery, Day excelled at striking batters out, especially with his high-speed fastball. At the same time, he was an above-average contact hitter, which, combined with his effectiveness as a baserunner and his tenacious fielding, helped cement Day as one of the most dynamic players of the era.