The 2007 World Series was the championship series of Major League Baseball's (MLB) 2007 season. The 103rd edition of the World Series, it was a best-of-seven playoff between the National League (NL) champion Colorado Rockies and the American League (AL) champion Boston Red Sox; the Red Sox swept the Rockies in four games. It was the Rockies' only appearance in a World Series. The Red Sox's victory was their second World Series championship in four seasons and their seventh overall; it also marked the third sweep in four years by the AL champions. The series began on Wednesday, October 24 and ended on Sunday, October 28.

The 2007 Major League Baseball season began on April 1 with a rematch of the 2006 National League Championship Series; the St. Louis Cardinals and New York Mets played the first game of the season at Busch Stadium in St. Louis, Missouri, which was won by the Mets, 6–1. The regular season concluded with seven teams entering the postseason who had failed to reach the 2006 playoffs including all National League teams, with only the New York Yankees returning; a dramatic one-game playoff between the Colorado Rockies and San Diego Padres; and the largest September collapse for a leading team in baseball history, with the Mets squandering a 7-game lead with 17 to play, losing on the final day of the regular season, and the Philadelphia Phillies capturing the National League East for the first time since 1993. The season ended on October 28, with the Boston Red Sox sweeping the World Series over the Rockies, four games to zero.