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 and desirable 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, coupled with his effectiveness as a baserunner and his tenacious fielding, helped cement Day as one of the most dynamic players of the era.

Debuting in the Negro leagues in 1934, Day played with the Baltimore Black Sox, Newark Eagles, and Baltimore Elite Giants during his career. In 1937, Day had the best season of his career as a member of the Eagles, finishing with a perfect record of 13-0 and a batting average over .300. Day was further known for his passion for the game, as he also played Puerto Rican winter ball in the offseasons. He holds both the Negro and Puerto Rican league records for strikeouts in a game, and appeared in the most East–West All-Star Games.

Because of his soft-spoken demeanor, Day's accomplishments were not immediately recognized as opposed to other elite pitchers of the league like Satchel Paige. Nonetheless, Day was finally elected into the Baseball Hall of Fame in 1995, just six days before his death at 78 years old. In more recent times, Day is considered one of the best pitchers of the Negro leagues, equaling and sometimes surpassing the abilities of his rivals.

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