The 2018 World Series was the championship series of Major League Baseball's 2018 season. The 114th edition of the World Series, it was a best-of-seven playoff played between the American League (AL) champion Boston Red Sox and the National League (NL) champion Los Angeles Dodgers. The Red Sox defeated the Dodgers in five games to win their fourth World Series title in 15 years dating back to 2004, and their ninth in franchise history. This was the second World Series matchup between the two franchises, after the Red Sox defeated the Brooklyn Robins in five games in 1916. The series was sponsored by the Internet television service YouTube TV and officially known as the 2018 World Series presented by YouTube TV.

The 2018 Boston Red Sox season was the 118th season in the team's history, and their 107th season at Fenway Park. Under first year manager Alex Cora, the team finished with a 108–54 record, winning the American League East division title for the third consecutive season, and finished eight games ahead of the second-place New York Yankees. The Red Sox were the first MLB team to post 100 wins during the 2018 season, reaching that milestone for the first time since 1946; they were also the first team to clinch a berth in the 2018 postseason.