| Term | Full Form | Category |
|---|---|---|
| FLU | Fault Location Unit | Others |
| FLU | Fiat Lancia Underground | Others |
| FLU | Fiat Lancia Unlimited | Others |
| FLU | Financial Litigation Unit | Others |
| FLU | Fluids Leaking Unstoppably | Others |
| Flu | Fluoxetine | Others |
| FLU | Freightliner Unimog | Others |
| FLU | Front Light Unit | Others |
| FLU | Front Line Unit | Others |
| FLU | Influenza![]() | Medical, Disease |