| HIAC | Hackney Information Advice Consortium 
| Others |
| HIAC | Hackney information and Advice Consortium
| Others |
| HIAC | Harvestworks International Art Collective
| Others |
| HIAC | Hawaii Island Adult Care
| Others |
| HIAC | Health Improvement and Awareness Committee
| Others |
| HIAC | Health Industry Advisory Council
| Others |
| HIAC | Health Information and Advocacy Centre
| Others |
| HIAC | Health Innovation Advisory Committee
| Others |
| HIAC | Health Insurance Advisory Council
| Others |
| HIAC | Helena International Affairs Council
| Others |
| HIAC | Hell in A Cell
| Others |
| HIAC | Hepatic intra arterial chemotherapy
| Others |
| HIAC | Hepatic Intra-Arterial Chemotherapy
| Others |
| HIAC | Higher Institute of Agricultural Cooperation
| Others |
| HIAC | Home Improvement Alliance Corporation
| Others |
| HIAC | Homeless Initiative Advisory Committee
| Others |
| HIAC | Homeschooling in a crunch
| Others |
| HIAC | Honorary Investment Advisory Committee
| Others |
| HIAC | Hornby Island Arts Council
| Others |
| HIAC | Houston International Arbitration Club
| Others |
| HIAC | Huntingdon Independent Advice Centre
| Others |