1989 Major League Baseball postseason

The 1989 Major League Baseball postseason was the playoff tournament of Major League Baseball for the 1989 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.

In the American League, the Oakland Athletics returned to the postseason for the second year in a row, and the Toronto Blue Jays returned for the second time in five years. The Blue Jays would return to the postseason in three of the next four seasons.

In the National League, the San Francisco Giants returned to the postseason for the second time in three years, and the Chicago Cubs returned for the second time in six years.

The playoffs began on October 3, 1989, and concluded on October 28, 1989, with the Athletics sweeping the Giants to win their first World Series title since 1974. The series became marred by the 1989 Loma Prieta earthquake which caused major damage to both Oakland and San Francisco, as well as Candlestick Park where Games 3 and 4 were played.