The 2004 American League Championship Series was Major League Baseball (MLB) playoff series to decide the champion of the American League (AL) for the 2004 season. It was played between the Boston Red Sox and New York Yankees. The Red Sox won the series four games to three having been down three games to none in the best-of-seven series. It was played at Fenway Park and Yankee Stadium, between October 12 and October 20, 2004.