The 1981 American League Division Series (ALDS), the opening round of the 1981 American League playoffs, began on Tuesday, October 6, and ended on Sunday, October 11. The Division Series were created on August 6 in response to the 1981 Major League Baseball strike, which caused the cancellation of roughly one-third of the regular season between June 12 and August 9; by the time play was resumed, it was decided that the best approach was to have the first-half leaders automatically qualify for postseason play, and allow all the teams to begin the second half with a clean slate.
The first-half and second-half champions in both the East and West divisions would meet in best-of-five series, with the winners advancing to the AL Championship Series (ALCS). If the same team won both halves, a wild card team—the second-place team from the second half—would qualify for the postseason, but this proved unnecessary in both leagues. There were no plans to continue the format in later seasons, although the Division Series resumed in 1995 after both major leagues realigned into three divisions. The teams in the 1981 ALDS were:
- Eastern Division: New York Yankees (first-half champion, 34–22) vs. Milwaukee Brewers (second-half champion, 31–22): Yankees win series, 3–2.
- Western Division: Oakland Athletics (first-half champion, 37–23) vs. Kansas City Royals (second-half champion, 30–23): Athletics win series, 3–0.
The second-half champions played the first two games at home, with the first-half champions potentially hosting the last three; the first-half champions all posted better records in their half of the season than the second-half champions did.
The Yankees and Athletics went on to meet in the AL Championship Series. The Yankees became the American League champion, and lost to the National League champion Los Angeles Dodgers in the 1981 World Series.
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