The 1985 American League Championship Series was played between the Kansas City Royals and the Toronto Blue Jays from October 8 to 16. Major League Baseball decided to extend the Championship Series in both leagues from its best-of-five (1969–1984) to the current best-of-seven format starting with this year, and it proved pivotal in the outcome of the ALCS. The Blue Jays seemingly put a stranglehold on the Series, earning a three games to one lead over the Royals after four games. However, Kansas City staged an improbable comeback, winning the next three games to win the American League Championship Series four games to three. The Royals would proceed to defeat their cross-state rivals, the St. Louis Cardinals, in the World Series four games to three.

The oddsmakers favored Toronto, 8–5. During the opening pregame show, NBC Sports baseball analyst Tony Kubek was among the few who predicted a Kansas City victory, citing the Blue Jays' struggles against left-handed pitching, and the Royals' plethora of left-handed starters. This prediction was especially curious considering Kubek worked on Blue Jays television broadcasts during the regular season.

The Royals had long been a contending team in the American League, with great regular season success but frustration in the playoffs. They won three consecutive American League West division titles from 1976 to 1978, only to be defeated in the ALCS all three years by the New York Yankees. The Royals did manage to defeat the Yankees and win the ALCS in 1980; however, they lost the World Series to the Philadelphia Phillies four games to two. In 1984, K.C. again won the West Division, but were swept in the ALCS by the eventual World champion Detroit Tigers, who won 20 more games during the regular season than the Royals. 1985 saw the Royals post a record of 91–71 (.562) winning another West Division pennant, ahead of the California Angels by a game.

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