| HACS | Hackathon and Computing Society 
| Others |
| HACS | Hand Action Coding System
| Others |
| HACS | Happy Action Candy Squad
| Others |
| HACS | Harper Adams Conservation Society
| Others |
| HACS | Hawaii Association Of Charter Schools
| Others |
| HACS | Hawaii Aviation Contract Services
| Others |
| HACS | Hazard Assessment Computer System
| Others |
| HACS | Health And Community Studies
| Others |
| HACS | Helium Automatic Changeover Switch
| Others |
| HACS | Hendersonville Area Computer Society
| Others |
| HACS | Hewanorra Air Cargo Services
| Others |
| HACS | High Accuracy Current Sensor
| Others |
| HACS | High Accuracy Current Sensors
| Others |
| HACS | High Amylose Corn Starch
| Others |
| HACS | High Angle Control System
| Others |
| HACS | Highly Adaptive Cybersecurity Services
| Others |
| HACS | Hillingdon Autistic Care and Support
| Others |
| HACS | Home Appliance Control System
| Others |
| HACS | Home Appliances Control System
| Others |
| HACS | Home Automation Control Systems
| Others |
| HACS | Homework Assignment And Collection System
| Others |
| HACS | Horizon Agencies Commercial Services
| Others |
| HACS | Hot Aisle Containment System
| Others |
| HACS | Houston Area Community Services
| Others |
| HACS | Human Abstract Commun System
| Others |
| HACS | Humanities And Cultural Studies
| Others |
| HACS | Hybrid Air Cushioning System
| Others |