The 1912 Boston Red Sox season was the 12th season in the franchise's Major League Baseball history. This was the first year that the team played its home games at Fenway Park. The Red Sox finished first in the American League (AL) with a record of 105 wins and 47 losses. The team set the franchise record for highest winning percentage (.691) in a season, which still stands; tied the franchise record for fewest losses in a season, originally set by the 1903 team; and set a franchise record for most wins, which was not surpassed until the 2018 club.

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.