ALCS (disambiguation)
ALCS most commonly in the United States refers to the American League Championship Series in Major League Baseball.
ALCS may also refer to:
- Abundant Life Christian School, a K4-12 school in Madison, Wisconsin
- ALCS transaction monitor, an IBM mainframe transaction processing monitor for the airline industry
- Authors' Licensing and Collecting Society, a British organization for writers
- Airborne Launch Control System, the method of launching ICBMs during a nuclear attack