Mace Stanley Brown (May 21, 1909 – March 24, 2002) was an American professional baseball player. He appeared in Major League Baseball, largely as a relief pitcher, over ten seasons (1935–43; 1946) for the Pittsburgh Pirates, Brooklyn Dodgers, and Boston Red Sox. Brown posted a 76–57 record with a 3.46 ERA and 44 saves in 387 appearances (55 as a starter).

Brown was also a javelin thrower who attended the University of Iowa on a track scholarship. He started his professional baseball career after college. In 1934, he won 19 games for the Tulsa Oilers of the Texas League and was purchased by the Pirates in November.

Brown became known as one of the first full-time relief specialists in the Major Leagues. In 1938, he led the Pirates with 15 wins (all in relief), led the National League with 51 games pitched, and became the first reliever to play the All-Star Game. In 1943, with the Red Sox, he also led the American League in games pitched with 49.

However, he is also known for giving up the Homer in the Gloamin', the home run that cost the Pirates their lead in the 1938 National League pennant race. On September 28, 1938, the Pirates were playing the Chicago Cubs, who trailed the Pirates by just one-half game in the league standings. Brown entered the game with the teams tied 5–5 in the bottom of the ninth inning. Darkness was falling fast, and the Cubs' Wrigley Field had no lights, meaning the game could end in a tie. But Gabby Hartnett soon smacked a pitch from Brown over the left-center field wall, giving the Cubs the victory and propelling them into first place. The Pirates proceeded to lose four of their final five games, securing the Cubs' hold on the pennant.

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