| ALCS | Abundant Life Christian School
| Others |
| ALCS | Administrative Local and Community Support
| Others |
| ALCS | Advance Liberty for Change Seminar
| Others |
| ALCS | Airborne Launch Control System
| Others |
| ALCS | AirLift Control Squadron
| Others |
| ALCS | Airline Control System
| Others |
| ALCS | Alien Labor Certification System
| Others |
| ALCS | American League Championship Series
| Others |
| ALCS | American Lumber Standards Committee
| Others |
| ALCS | Assembly Line Control System
| Others |
| ALCS | Atonement Lutheran Church and School
| Others |
| ALCS | Authors Licensing and Collecting Society
| Others |
| ALCS | Authors Licensing Collecting Society
| Others |
| ALCS | Automated Logistics Control System
| Others |