John Leo Dowd (born John Leo O'Dowd from January 3, 1891, to January 31, 1981) was a Major League Baseball shortstop. He played for the New York Highlanders in 1912. In 10 career games, he had a .194 batting average, with six hits in 31 at-bats. He batted and threw right-handed.
Dowd was born in Weymouth, Massachusetts, and died in Fort Lauderdale, Florida.