| Abbreviation | Definition |
|---|---|
| HEAA | Hoffman Estates Athletic Association |
| HEAT | Hawkeye Elite Athletic Training |
| HEAT | High Energy Athletic Training |
| HEAT | Highly Effective Athletic Training |
| HEAT | Holistic Extreme Athletic Training |
| HEAT | Home Educated Athletic Team |
| HIAAA | Hagerstown Ice Amateur Athletic Association |
| HPAA | Huron Perth Athletic Association |
| HUSTLE | Hurrying Up So That Laziness Ends |
| HVAA | Hoosic Valley Athletic Association |
| HVAA | Huntingdon Valley Athletics Association |
| HYA | Hamilton Youth Athletics |
| IAAA | Idaho Athletic Administrators Association |
| IAAC | Inter-collegiate Athletics Advisory Committee |
| IAAF | International Amateur Athletic Federation |
| IAAF | International Amateur Athletic Foundation |
| IAAF | International Amateur Athletics Federation |
| IAAF | International Association of Athletics Federations |
| IAAU | Irish Amateur Athletic Union |
| IABO | Inter-collegiate Athletics Business Office |