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.