According to the search results, the following teams were in the MLB playoffs in 2023:

American League:

• Baltimore Orioles (1st seed)
• Houston Astros (2nd seed)
• Minnesota Twins (3rd seed)
• Tampa Bay Rays (4th seed)
• Texas Rangers (5th seed)
• Toronto Blue Jays (6th seed)

National League:

• Atlanta Braves (1st seed)
• Los Angeles Dodgers (2nd seed)
• Milwaukee Brewers (3rd seed)
• Arizona Diamondbacks (4th seed)
• Miami Marlins (5th seed)
• Philadelphia Phillies (6th seed)

The playoffs began on October 3, 2023, with the Wild Card Series, which was a best-of-three format. The winners of the Wild Card Series faced the two best division winners (seeds) in each league in the Division Series, and the victors advanced to the League Championship Series to determine the pennant winners who played each other in the 2023 World Series. The World Series began on October 27, 2023, and ended on November 1, 2023, with the Texas Rangers defeating the Arizona Diamondbacks to clinch their first title in franchise history.