2005 Major League Baseball season

Angels

     Athletics

Mariners

Rangers

White Sox

Indians

Tigers      

Royals

Twins

Orioles

Red
Sox

Yankees

Devil Rays

Blue
Jays

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Locations of AL teams for the 2005–2007 MLB seasons
West   Central   East

Diamondbacks

Rockies

Dodgers

Padres

  Giants

Cubs

Reds

Astros

Brewers

Pirates  

Cardinals

Braves

Marlins

Mets

Phillies

Nationals

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Locations of NL teams for the 2005 MLB season
West   Central   East

The 2005 Major League Baseball season was notable for the league's new steroid policy in the wake of the BALCO scandal, which enforced harsher penalties than ever before for steroid use in Major League Baseball. Several players, including veteran Rafael Palmeiro, were suspended under the new policy. Besides steroids it was also notable that every team in the NL East finished the season with at least 81 wins (at least half of the 162 games played). Additionally it was the first season featuring a baseball team in Washington, D.C. since the second iteration of the Washington Senators last played there in 1971; the Washington Nationals had moved from Montreal, the first relocation of a team in 33 years and currently the most recent time this has occurred in the majors.

The Anaheim Angels changed their name to the Los Angeles Angels of Anaheim.

The season ended when the Chicago White Sox defeated the Houston Astros in a four-game sweep in the World Series, winning their first championship since 1917.

As of the 2024 season, this is the last season in which no no-hit games were pitched; 2005 was also only the 6th year since 1949 in which no such games were thrown.^[a]

This was the first season since 1993 that all teams played at least 162 games with no cancellations.