| Acronym | Definition |
|---|
| HIU | Health Insurance Unit |
| HIU | Hope International University (Fullerton, CA, USA) |
| HIU | Horseed International University (Mogadishu, Somalia) |
| HIU | Hokkaido Imperial University (Japan) |
| HIU | Hearing Impaired Unit (schools; various locations) |
| HIU | High Intensity Urban (zoning; various locations) |
| HIU | Headset Interface Unit (aviation) |
| HIU | Humanitarian Information Unit (US Dept of State) |
| HIU | Host Interface Unit |
| HIU | Hong Ik University (Seoul, Korea) |
| HIU | Hydraulic Interface Unit |
| HIU | Hook It Up (gaming team) |
| HIU | Homicide Investigations Unit (NYPD) |
| HIU | Human Intelligence Unit |
| HIU | High-Interest Unit |