| Abbreviation | Definition |
|---|---|
| HREA | Human Research Ethics Advisory |
| HSAC | Homeland Security Advisory Council |
| HSAS | Homeland Security Advisory System |
| HTAC | Harbor Technical Advisory Committee |
| HTAG | Health and Technology Advisory Group |
| HWAG | Hen Welfare Advisory Group |
| IAAC | Independent Audit Advisory Committee |
| IAAS | Icesinternal Audit Advisory Services |
| IAAS | Internal Audit And Advisory Services |
| IAB | International Advisory Board |
| IAE | International Advisory Experts |
| IAG | Investor Advisory Group |
| IAMB | International Advisory Monitoring Board |
| IAOC | Independent Advisory Oversight Committee |
| IAR | Investment Advisory Representative |
| IASB | International Advisory Standards Board |
| IBLAC | International Business Leaders Advisory Council (UK) |
| ICAC | International Cotton Advisory Committee |
| ICAS | Independent Counselling and Advisory Services |
| IDVA | Independent Domestic Violence Advisory |