William Henry Kelly (December 28, 1898 – April 8, 1990) was an American first baseman and scout in Major League Baseball, and a star power-hitter, umpire and manager in minor league baseball.

The native of Syracuse, New York, threw and batted right-handed, stood 6' (183 cm) tall and weighed 190 pounds (86 kg) as a player.

As a minor leaguer from 1921 to 1931, Kelly batted .308 and slugged 207 home runs.

After World War II, he moved into the dugout as a manager in the Chicago Cubs farm system, piloting top-level farm teams with the Los Angeles Angels of the Pacific Coast League (1947–50) and the Springfield Cubs of the International League (1951–52).

After hanging up his uniform in 1954, Kelly scouted for the Cubs, Phillies and New York Mets through 1974 and his retirement.