The 1925 major league baseball season began on April 14, 1925. The regular season ended on October 4, with the Pittsburgh Pirates and Washington Senators as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the 22nd World Series on October 7 and ended with Game 7 on October 15. The Pirates defeated the Senators, four games to three, capturing their second championship in franchise history, since their previous in . Going into the season, the defending World Series champions were the Washington Senators from the season.
This was the fourth of eight seasons that "League Awards", a precursor to the Major League Baseball Most Valuable Player Award (introduced in 1931), were issued.
The 1925 schedule consisted of 154 games for all teams in the American League and National League, each of which had eight teams. Each team was scheduled to play 22 games against the other seven teams of their respective league. This continued the format put in place since the season (except for ) and would be used until in the American League and in the National League.
Opening Day, April 14, featured all sixteen teams, continuing the trend which started with the previous season. The final day of the regular season was on October 4. The World Series took place between October 7 and October 15.
The 1925 season saw the stipulation that the minimum home run distance was 250 feet.
4 tie games (4 in AL, 0 in NL), which are not factored into winning percentage or games behind (and were often replayed again) occurred throughout the season.
The Detroit Tigers and New York Yankees had two tie games each. The Cleveland Indians, Philadelphia Athletics, St. Louis Browns, and Washington Senators had one tie game each.
The postseason began on October 7 and ended on October 15 with the Pittsburgh Pirates defeating the Washington Senators in the 1925 World Series in seven games.
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<sup>1</sup> National League Triple Crown batting winner