| 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 |