| 1990 American League Championship Series | ||||||||||
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| Dates | October 6–10 | |||||||||
| MVP | Dave Stewart (Oakland) | |||||||||
| Umpires | Rich Garcia (crew chief) John Hirschbeck Jim Evans Terry Cooney Vic Voltaggio Larry McCoy | |||||||||
| Broadcast | ||||||||||
| Television | CBS | |||||||||
| TV announcers | Dick Stockton and Jim Kaat | |||||||||
| Radio | CBS | |||||||||
| Radio announcers | Jim Hunter and Johnny Bench | |||||||||
| Streaming | ||||||||||
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The 1990 American League Championship Series was a best-of-seven series that matched the East Division champion Boston Red Sox against the West Division champion Oakland Athletics. For the second time in three years, the Athletics swept the Red Sox four games to none. The sweep was capped by a Roger Clemens ejection in Game 4 for arguing balls and strikes. The Athletics would go on to lose to the Cincinnati Reds in the 1990 World Series in a four-game sweep.