HOI
| Acronym | Definition |
|---|---|
| HOI | Heart of Illinois |
| HOI | Hearts of Iron (video game) |
| HOI | Halls of Illusions (fansite) |
| HOI | Hoag Orthopedic Institute (Irvine, CA) |
| HOI | Housing Opportunity Index |
| HOI | Home Owner's Insurance |
| HOI | Handbook of Overhaul Instructions |
| HOI | Host Interface |
| HOI | Headquarters Operating Instruction (USAF, NORAD) |
| HOI | House of Invention International |