John Millard Campbell (September 13, 1907 – April 24, 1995) was an American professional baseball pitcher. He played in Major League Baseball for one season (1933) with the Washington Senators. For his career, he appeared in one game and pitched one inning, allowing an unearned run.
An alumnus of the University of Alabama, he was born in Washington, D.C., and died in Daytona Beach, Florida at the age of 87.