The 2019 American League Championship Series was a best-of-seven series in Major League Baseball's 2019 postseason between the two winners of the 2019 American League Division Series; the overall #1 seed Houston Astros and the second-seeded New York Yankees, for the American League (AL) pennant and the right to play in the 2019 World Series. The Astros defeated the Yankees in six games, advancing to face the 2019 National League champions, the Washington Nationals, whom they lost to in seven games.

The series was played in a 2–3–2 format, with the Astros, having the better regular season record, hosting the first two and last two (if necessary) games. The series was the 50th in league history, with Fox/FS1 televising all games in the United States.

For the third straight year, Major League Baseball sold presenting sponsorships to all of its postseason series; as with the NLCS, this ALCS was sponsored by GEICO and officially known as the 2019 American League Championship Series presented by GEICO.

The best-of-five American League Division Series were scheduled for October 4–10.

The top-seeded Houston Astros won their first two games against the Tampa Bay Rays, winner of the American League Wild Card Game. The Rays won the next two games to force a deciding Game 5, which Houston won to advance to their third straight ALCS; each game of the series was won by the home team. Houston was 1–1 in prior ALCS appearances. When they competed in the National League, Houston was 1–3 in NLCS appearances.

The second-seeded New York Yankees swept their series against the third-seeded Minnesota Twins to clinch their 17th ALCS appearance. New York was 11–5 in prior ALCS appearances.

This series was a sequel to the 2017 ALCS, which the Astros won in seven games, and the third overall postseason meeting between the two teams. The Astros and Yankees faced each other seven times during the 2019 regular season, with the Astros winning four of those games.

Houston won the series, 4–2.