James Donald Brennan (December 2, 1903 – April 26, 1953) was a Major League Baseballpitcher who played from 1933 to 1937 with several teams. He batted and threw right-handed. Brennan had a 21–12 record with a 4.19 earned run average over 397 innings pitched in 141 career games.[1] In his final year, he pitched for the National League champion New York Giants against their crosstown rival New York Yankees, tossing 3 scoreless innings across 2 games in the 1937 World Series.[2]