| Abbreviation | Definition |
|---|---|
| HYN | Hyundai |
| HZL | Hindustan Zinc Limited |
| HZL | Hindustan Zinc Ltd |
| IA | Indian Airlines |
| IA | Infinite Audio |
| IA | International Auctioneers |
| IA | Investment Advisor |
| IABB | International Association of Beauty Brands |
| IAC | In Any Case |
| IAC | Industrial Acceptance Corporation |
| IAC | Industrial Assessment Center |
| IAC | InterActiveCorp |
| IACEI | International Academic Credential Evaluators Inc. |
| IACI | Idaho Association of Commerce and Industry |
| IACOCCA | I Am Chairman Of Chrysler Corporation America |
| IAD | Independent ATM Deployer |
| IAE | International Aero Engines |
| IAEC | Iowa Association of Electric Cooperatives |
| IAEL | Irish American Events Ltd |
| IAFI | Indiana Automotive Fasteners Inc |