RIU
| Acronym | Definition |
|---|---|
| RIU | Remote Interface Unit |
| RIU | Regulatory Impact Unit (United Kingdom) |
| RIU | Radioactive Iodine Uptake |
| RIU | Radio Interface Unit |
| RIU | Refractive Index Unit |
| RIU | Riverine Interdiction Unit |
| RIU | Ring Interface Unit |
| RIU | Radar/Remote Interface Unit |
| RIU | Remux Interface Unit |