HIWG
| Acronym | Definition |
|---|---|
| HIWG | Humanitarian Issues Working Group (UN High Commissioner for Refugees; Geneva, Switzerland) |
| HIWG | History of the Imperium Working Group (Traveller roleplaying game fan group) |
| HIWG | Holocene Impact Working Group (climate change) |
| HIWG | Health Insurance Working Group |
| HIWG | Hawaii Wing (Civil Air Patrol) |
| HIWG | Honouring Indigenous War Graves, Inc. (Australia) |