The 1904 St. Louis Browns season was a season in American baseball. The team finished sixth in the American League with a record of 65 wins and 87 losses, 29 games behind the Boston Americans.

The 1904 Boston Americans season was the fourth season for the professional baseball franchise that later became known as the Boston Red Sox. The Americans finished first in the American League (AL) with a record of 95 wins and 59 losses, 1+1⁄2 games ahead of the New York Highlanders. The team was managed by Jimmy Collins and played its home games at Huntington Avenue Grounds. The Americans were set to play the National League (NL) champion New York Giants in the 1904 World Series; however, the Giants refused to play.