| Abbreviation | Definition |
|---|---|
| HPCN | Home Performance Contractor Network |
| HPVA | Hardwood Plywood Veneer Association |
| HPVA | Hardwood Plywood & Veneer Association |
| HTC | High Trust Culture |
| IBITA | International Beauty Industry Trade Association |
| IBM | I Believe in Medallia |
| ICSID | International Council of Societies of Industrial Design |
| IDCA | International Data Center Authority |
| IDTA | Irish Dental Trade Association |
| IGO | International governmental organisation |
| ILMA | Interior Lumber Manufacturers' Association |
| IMSC | Independent Mystery Shoppers Coalition |
| InterNACHI | InterNational Association of Certified Home Inspectors |
| IOSDA | Iron Ore and Steel Derivatives Association |
| IRATA | Indonesian Reptile and Amphibian Trade Association |
| IRATA | Industrial Rope Access Trade Association |
| IRATA | International Rope Access Trade Association |
| ISSUP | International Society of Substance Use Prevention and Treatment Professionals |
| ISSW | International Snow Science Workshops |
| ITAC | Indigenous Tourism Association of Canada |