| Acronym | Definition |
|---|
| FIU | Florida International University |
| FIU | Financial Intelligence Unit |
| FIU | Fire It Up |
| FIU | Faculdades Integradas Urubupungá (Brazilian college) |
| FIU | Fingerprint Identification Unit |
| FIU | Fingerprint Identification Unit (Sony) |
| FIU | Fire Investigation Unit |
| FIU | Forensic Identification Unit (various locations) |
| FIU | Fraud Investigation Unit (UK) |
| FIU | Foundation for International Understanding |
| FIU | Facsimile Interface Unit |
| FIU | Florida Intelligence Unit |
| FIU | Forensic Investigation Unit |
| FIU | Facilities Interface Unit |
| FIU | Fiber Interface Unit |
| FIU | Forward Interpretation Unit |
| FIU | FDDI Interface Unit |
| FIU | Fault Insertion Unit (aircraft) |
| FIU | Fiber Optic Interface Unit |
| FIU | Files and Information Unit |