| HAC | Habbo Advice Centre 
| Others |
| HAC | Hachijo Jima, Japan
| Others |
| HAC | Hackers Always Conqueror
| Others |
| HAC | Haima Automobile Corporation
| Others |
| HAC | Halloway Arms Company
| Others |
| HAC | Hamburg American Clock
| Others |
| HAC | Harrah's Automobile Collection
| Others |
| HAC | Hazardous Area Classification
| Others |
| HAC | Heading Alignment Cone
| Others |
| HAC | Health Administration Center
| Others |
| HAC | Health Advisory Committee
| Others |
| HAC | Health And Communication
| Others |
| HAC | Hear All Continents
| Others |
| HAC | Hearing Aid Compatibility
| Others |
| HAC | Hearing Aid Compatible
| Others |
| HAC | Heater Air Conditioning
| Others |
| HAC | Helicopter Aircraft Commander
| Others |
| HAC | Henry Austin Clark
| Others |
| HAC | Hepatic Arterial Chemotherapy
| Others |
| HAC | Heteroscedasticity and Autocorrelation Consistent
| Others |
| HAC | Hierarchical Access Control
| Others |
| HAC | Hierarchical Agglomerative Clustering
| Others |
| HAC | Hierarchical Archimedean Copulae
| Others |
| HAC | Hierarchy And Content
| Others |
| HAC | High Accuracy Clock
| Others |
| HAC | High Altitude Compensator
| Others |
| HAC | High Amperage Charger
| Others |
| HAC | High Availability Clustering
| Others |
| HAC | High Availability Clusters
| Others |
| HAC | Highlight and Contour
| Others |
| HAC | Highlighting and Contouring
| Others |
| HAC | Hill Ascent Control
| Others |
| HAC | Hill Start Assist Control
| Others |
| HAC | Hindustan Aluminium Corporation
| Others |
| HAC | Hirschvogel Automotive Components
| Others |
| HAC | Historic Automobile Club
| Others |
| HAC | Hockessin Athletic Club
| Others |
| HAC | Holiday.Archiv.Com
| Others |
| HAC | Holloway Arms Company
| Others |
| HAC | Home Access Center
| Others |
| HAC | Honda Access Corporation
| Others |
| HAC | Honda Accord Community
| Others |
| HAC | Honda Atlas Cars
| Others |
| HAC | Horler And Company
| Others |
| HAC | Hospital Acquired Condition
| Others |
| HAC | Hospital Acquired Conditions
| Others |
| HAC | Hospital-acquired condition
| Others |
| HAC | House Appropriations Committee
| Others |
| HAC | Housing Assistance Corporation
| Others |
| HAC | Housing Assistance Council
| Others |
| HAC | Huachuca Astronomy Club
| Others |
| HAC | Hughes Aircraft Company
| Others |
| HAC | Human Artificial Chromosome
| Others |
| HAC | Humber Armoured Car
| Others |
| HAC | Huntingdale Auto Club
| Others |
| HAC | HydroxyApatite Cement
| Others |
| HAC | HyperAdrenoCorticism
| Others |
| HAC | Hyundai Assembly Center
| Others |
| HAC | Hyundai Auto Canada
| Others |