1980 Major League Baseball postseason

The 1980 Major League Baseball postseason was the playoff tournament of Major League Baseball for the 1980 season. The winners of each division advance to the postseason and face each other in a League Championship Series to determine the pennant winners that face each other in the World Series.

For the fourth time in the past six years, the postseason once again featured the New York Yankees, Kansas City Royals, and Philadelphia Phillies. The Houston Astros also made their first postseason appearance in franchise history this year. All four teams would return during the expanded 1981 postseason, as due to the lockout-shortened season, the season was split in half and the division leaders during each half qualified for the postseason.

The playoffs began on October 7, 1980, and concluded on October 21, 1980, with the Phillies defeating the Royals in six games in the 1980 World Series. This was the first championship in franchise history for the Phillies.