The Montgomery Grey Sox were a Negro Southern League (NSL) baseball team based in Montgomery, Alabama. While the NSL was regarded as a minor league throughout most of its existence, with the collapse of the first Negro National League in 1932, the league is considered a major league for that one season. In 1920 the Grey Sox made it into the league pennant race with a 3-0 perfect game win over Atlanta. In 1920, the Grey Sox played in Southside Park.