| Abbreviation | Definition |
|---|---|
| HICSS | Hawaii International Conference on Systems Sciences |
| HICST | Hawaii International Conference on System Sciences: Software Track |
| HIIC | Hellenic Impact Investing Conference |
| HINH | Humanities in Health Conference |
| HIPC | International Conference on HIgh Performance Computing |
| HIPS | International Workshop on HIgh-Level Programming models and Supportive Environments |
| HITEC | High Impact Technology Exchange Conference |
| HITEC | Hospitality Industry Technology Exposition Conference |
| HKCEC | Hong Kong Convention and Exhibition Centre |
| HKEDM | IEEE Hong Kong Electron Devices Meeting |
| HLCL | International Workshop on High-Level Concurrent Languages |
| HLDC | Hospitality Leadership and Design Conference |
| HLLS | Hotel Lodging Legal Summit |
| HLST | Hospitality, Leisure, Sport and Tourism |
| HMC | Headmasters' and Headmistresses' Conference |
| HMEC | Hindu Mandir Executives' Conference |
| HMPC | Hindu Mandir Priests Conference |
| HOC | Hearing Officer Conference |
| HOIC | Heart of Illinois Conference |
| HOLM | IEEE HOLM Conference on Electrical Contacts |