The 1989 American League Championship Series was played between the Oakland Athletics and the Toronto Blue Jays from October 3 to 8. A dominant Oakland team took the Series four games to one, en route to a sweep of their cross-bay rivals, the San Francisco Giants, in a World Series marred by the destructive Loma Prieta earthquake.

The Athletics finished the 1989 regular season as the best overall team in baseball, with a 99–63 record (.611). They easily won the American League West division title by seven games over the Kansas City Royals. The Blue Jays finished the 1989 regular season with an 89–73 record (.549). However, their winning of the American League East division title was by a much narrower margin: only two games over the Baltimore Orioles.

The ALCS began with Games 1 and 2 being played at the Oakland–Alameda County Coliseum, with the Athletics winning both. The Series then shifted to the SkyDome in Toronto, where the Blue Jays managed a win in Game 3 before losing Games 4 and 5 to Oakland. Athletics ace Dave Stewart earned two wins (in Games 1 and 5), while closer Dennis Eckersley saved three games (Games 2, 4, and 5) to send Oakland to the World Series.

Athletics left fielder Rickey Henderson was named the ALCS MVP. During the Series, Henderson had doubled, tripled, hit two home runs (in Game 4), and knocked in five runs batted in.

Oakland won the series, 4–1.

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