The 1911 Major League Baseball season began on April 12, 1911. The regular season ended on October 12, with the New York Giants and Philadelphia Athletics as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the eighth modern World Series on October 14 and ended with Game 6 on October 26. The Athletics defeated the Giants, four games to two.

Red Sox

White Sox

Naps

Tigers

Athletics

Browns

Highlanders

Senators

Locations of AL teams for the 1911 MLB season
American League

Rustlers

Trolley
Dodgers

Cubs

Reds

Giants

Phillies

Pirates

Cardinals

Locations of NL teams for the 1911 MLB season
National League

This was the first of four seasons that the Chalmers Award, a precursor to the Major League Baseball Most Valuable Player Award (introduced in 1931), was given to a player in each league.

This is the most recent major league season from which no stadiums remain in use. The Boston Red Sox have used Fenway Park as their home field since the 1912 season.

The 1911 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 for the 1904 season. This format would last until 1919.

Opening Day took place on April 12 with all but the Chicago White Sox and Detroit Tigers playing. The American League would see its final day of the regular season on October 8, while the National League would see its final day of the regular season was on October 12. The World Series took place between October 14 and October 26.

• Chalmers Award
  • Ty Cobb, Detroit Tigers, OF
  • Frank Schulte, Chicago Cubs, OF

• June 27 – Stuffy McInnis of the Philadelphia Athletics hits a warm-up pitch by Boston Red Sox pitcher Ed Karger for an inside-the-park home run.^[17]
• July 12 – Ty Cobb of the Detroit Tigers steals second, third and home on consecutive pitches by Philadelphia Athletics pitcher Harry Krause.^[18]
• July 24 – In the Addie Joss Benefit Game, a team of American League all-stars defeats the Cleveland Naps, 5-3, and raise $12,914 for Joss's widow.^[19]