The 2001 Major League Baseball season finished with the Arizona Diamondbacks defeating the New York Yankees in seven games for the World Series championship. The September 11 terrorist attacks on New York and Washington, D.C. pushed the end of the regular season from September 30 to October 7. Because of the attacks, the World Series was not completed until November 4. The 2001 World Series was the first World Series to end in November.

The 2001 New York Yankees season was the 99th season for the Yankees. The team finished with a record of 95–65 finishing 13.5 games ahead of the Boston Red Sox. New York was managed by Joe Torre. The Yankees played at Yankee Stadium. Roger Clemens had sixteen straight wins, tying an American League mark shared by Walter Johnson, Lefty Grove, Schoolboy Rowe, and Smoky Joe Wood. Clemens would finish the season with the AL Cy Young Award and become the first pitcher to win six Cy Young Awards.