This is a list of Major League Baseball franchise postseason and World Series droughts. Those teams which have never made it in franchise history are listed by the date they entered the leagues. The list includes only the modern World Series between the American League and the National League, not the various 19th-century championship series.

MLB franchises with the longest current post-season drought
* Year does not indicate a pennant, but rather the team's first year of existence.

MLB franchises with the longest current league pennant drought
* Year does not indicate a championship, but rather the team's first year of existence.

Cities waiting for their first World Series crown
List begins with 1903, about the time the current configuration of National League and American League stabilized. Note that no pennants were won in 1994 due to strike. This list only shows droughts of 20 or more years.
* Year does not indicate a pennant, but rather the team's first year of existence or the first year of this list (1903).

Longest major league pennant droughts through history
The first World Series was played in 1903. Note that no World Series was played in 1904 or 1994. This list only shows droughts of 30 or more years.
* Year does not indicate a title won, but rather the team's first year of existence or the first year of this list (1903).
Bold is active drought.

Longest World Series crown droughts through history

World Series in which both teams were making their first Series appearance

World Series in which both teams were ending 20-year-plus pennant droughts
* Note: In 2002, the Giants had been in San Francisco for 45 years; in 1995, the Braves had been in Atlanta for 30 years; in 1972, the Athletics had been in Oakland for 5 years.