The 1927 World Series was the championship series in Major League Baseball for the 1927 season. The 24th edition of the World Series, it matched the American League champion New York Yankees against the National League champion Pittsburgh Pirates. The Yankees won in four games. This was the first sweep of a National League team by an American League team.

The 1927 New York Yankees season was the 25th season of the New York Yankees of the American League. The team finished with a record of 110–44–1, winning their fifth pennant and finishing 19 games ahead of the Philadelphia Athletics and were tied for first or better for the whole season. New York was managed by Miller Huggins, and played at Yankee Stadium. They won the 1927 World Series, sweeping the Pittsburgh Pirates. This Yankees team was known for its feared lineup, which was nicknamed "Murderers' Row", and is widely considered to be the greatest baseball team in MLB history.