This is a list of Major League Baseball (MLB) franchise postseason and World Series streaks.
When a multi-tier playoff system was implemented in 1995, the LCS remained the series that determined the pennant-winner.
The longest streak of consecutive LCS appearances belongs to the Atlanta Braves with eight in a row from 1991 to 1999 (not counting 1994, when there were no playoffs).
In this era, the Braves entered the postseason 14 consecutive years from 1991 to 2005 (again not counting 1994), while the Yankees had a streak of 13 appearances from 1995 to 2007.
However, all other postseason appearance streaks of 6 years or more predate the expanded-postseason era and are mentioned above, except for an ongoing 12-year run by the Los Angeles Dodgers (2013–2024).
The Braves appeared in every LCS held from 1991 to 1999, which is eight in a row, winning five league pennants and one World Series championship during that time.
The American League record is held by the Houston Astros, who have appeared in the ALCS in seven straight seasons from 2017 to 2023 that has resulted in four pennants and two world titles.
The Oakland Athletics in their "Swingin' A's" era previously held the AL record with five appearances in a row, which saw them win three world titles.
The Atlanta Braves was the closest team in consecutive seasons with at least one playoff series win, with 5 from 1995–1999.