Michael Joseph Kelley (December 2, 1875 – June 6, 1955) was an American Major League Baseball first baseman. He played one season in the majors with the 1899 Louisville Colonels. He then forged a 30-year career as a manager in the minor leagues and became a legendary figure in the "Twin Cities" of Minneapolis–St. Paul.

Born in Templeton, Massachusetts, Kelley played only one season in the Major Leagues, with the 1899 Louisville Colonels of the National League. A right-handed hitter and thrower, he appeared in 76 games that season, and he batted .241 with three home runs and had 33 runs batted in. At the end of the season, the NL shrunk from 12 to eight teams and the Colonels were disbanded. Many Louisville players were acquired by the surviving Pittsburgh Pirates, but Kelley returned to the minors.

By 1901, he was managing Des Moines in the Western League, and the following season he was named pilot of the St. Paul Saints of the American Association, where he won back-to-back pennants in 1903–1904.

Apart from 4½ seasons, Kelley managed in the Twin Cities through 1931. He coached the St. Paul team for nearly 18 seasons (1902–05; August 1908 – 1912; 1915–23), where he won five championships. His 1920 Saints won 115 games, the 1922 team notched 107 victories – each time winning the pennant – and his 1923 club won 111 games while finishing second, two games behind the Kansas City Blues.

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