| Abbreviation | Definition |
|---|---|
| HUPS | Hotel Ustica Punta Spalmatore H U P S |
| HVF | Hotel Villa Fontaine |
| HVI | Hotel Valuation Index |
| HVMT | highway vehicle miles traveled |
| HWS | Hotel Web Systems |
| HWT | Harvey World Travel |
| HZP | Hotel zur Post |
| IAGTO | International Association of Golf Travel Operators |
| IAST | International Academy for the Study of Tourism |
| IATA | International Aviation and Travel Academy |
| IATAL | International Air Travel Adaptation Levy |
| IATAN | International Airlines Travel Agent Network |
| IATAN | International Airlines Travel Agents Network |
| IATP | Individual Antiterrorism Travel Plan |
| IATS | Institute of Air Travel Studies |
| IATS | Integrated Automated Travel System |
| IATT | Inland Air Travel Tax |
| IBT | International Bicycle Tours |
| IBT | International Bike Tours |
| ICHTO | Iran Cultural Heritage and Tourism Organization |