| Acronym | Definition |
|---|
| HAC➣Hearing Aid Compatible |
| HAC➣Hill-Start Assist Control (automobiles) |
| HAC➣Housing Assistance Council |
| HAC➣Home Access Center |
| HAC➣Acetic Acid |
| HAC➣Hierarchical Agglomerative Clustering |
| HAC➣High Availability Clustering |
| HAC➣Hierarchy and Content |
| HAC➣Hill Start Assist Control |
| HAC➣Honourable Artillery Company |
| HAC➣Heritage Advisory Council (various organizations) |
| HAC➣Health Action in Crises (UN World Health Organization) |
| HAC➣Harbour Arts Centre (UK) |
| HAC➣Home Affairs Committee (UK) |
| HAC➣House Appropriations Committee |
| HAC➣Havre Athletic Club (Le Havre, France) |
| HAC➣Heritage Advisory Committee (various locations) |
| HAC➣Huntington Arts Council (Huntington, NY) |
| HAC➣Health Administration Center (US VA) |
| HAC➣Houston Area Council (American Business Women's Association; Texas) |
| HAC➣Hawkesbury Agricultural College (Australia) |
| HAC➣Acetaldehyde |
| HAC➣Humanitarian Aid Commission |
| HAC➣Haitian American Caucus |
| HAC➣Hospital Acquired Condition |
| HAC➣Human Artificial Chromosome |
| HAC➣Hearing Aid Council |
| HAC➣Hyperadrenocorticism |
| HAC➣Honors and Awards Committee (various organizations) |
| HAC➣High Alumina Cement |
| HAC➣Housing Advice Centre (various locations) |
| HAC➣Houston Area Chapter (various organizations; Houston, TX) |
| HAC➣Humanist Association of Canada |
| HAC➣Heading Alignment Cone (US NASA) |
| HAC➣Haiti Action Committee (Berkeley, CA) |
| HAC➣Helicopter Aircraft Commander |
| HAC➣High Availability Clustering (computing) |
| HAC➣Health Access Coalition |
| HAC➣Honorary Advisory Committee (various organizations) |
| HAC➣Hydrogen-Assisted Cracking |
| HAC➣Heading Alignment Cylinder (US NASA) |
| HAC➣Heinous, Atrocious, and Cruel (crime categorization) |
| HAC➣Hot Action Cop (band) |
| HAC➣Hybrid Adaptive Caching |
| HAC➣Hazardous Area Classification |
| HAC➣High Administrative Court (various locations) |
| HAC➣Humanitarian Affairs Commission |
| HAC➣Hockessin Athletic Club (Hockessin, DE) |
| HAC➣Heading Alignment Circle (NASA; space shuttle) |
| HAC➣Homeless Action Center (legal services agency, Berkeley California) |
| HAC➣Heavy Assault Cruiser (gaming, EVE Online) |
| HAC➣Hamilton Arts Collective (Baltimore, MD) |
| HAC➣Hydrogenated Amorphous Carbon |
| HAC➣Hawaii Advisory Committee (USCCR) |
| HAC➣Higher Authority Communications |
| HAC➣High Altitude Compensator |
| HAC➣Human Animal Contact |
| HAC➣Have A Cow |
| HAC➣High Altitude Compensation |
| HAC➣Hughes Aircraft Corporation |
| HAC➣Hmong American Community |
| HAC➣High Aspect Contact |
| HAC➣High Angle Conveyor |
| HAC➣Hot Asian Chick |
| HAC➣Human Assurance Committee (Medical College of Georgia) |
| HAC➣Health Assessment Questionnaire (used to assess quality of life) |
| HAC➣Hybrid Aircraft Corporation (Edgewood, NM) |
| HAC➣Heparin Affinity Chromatography |
| HAC➣Hydroxyapatite Ceramics |
| HAC➣Heteroscedasticity Autocorrelation-Consistent |
| HAC➣Hydroxyapatite Chromatography |
| HAC➣Hollywood Advisory Council |
| HAC➣Host America Corporation |
| HAC➣High Acceleration Cockpit |
| HAC➣Harbor and Approach Chart |
| HAC➣Help the Afghan Children |
| HAC➣HIDTA Assistance Center |
| HAC➣Hawaii Air Cargo (Honolulu, HI) |
| HAC➣Hansard Association of Canada |
| HAC➣Hierarchical Aglomerative Clustering (datamining) |
| HAC➣High Availability Component |
| HAC➣Humanitarian Area Coordinator |
| HAC➣Homeland Acquisition Corporation (Oklahoma City, OK) |
| HAC➣Hot Athletic Chick |
| HAC➣High Accumulator (USAF SACCS 465L EDTCC SPE) |
| HAC➣Hands across the Campus (American Jewish Committee) |
| HAC➣Hudson Associates Consulting, Inc (Virginia Beach, VA) |
| HAC➣Head Ally Cockroft (Australian-based consulting firm) |