FLU
| Acronym | Definition |
|---|---|
| FLU | Influenza |
| FLU | Flute (music scores) |
| FLU | Forestry and Land Use (various organizations) |
| FLU | Front Line Unit |
| FLU | Fiat Lancia Unlimited (automobile club) |
| FLU | Financial Litigation Unit (US Department of Justice) |
| FLU | Fault Location Unit |
| FLU | Forced Labour Unit (gaming, Master of Orion 3) |
| FLU | Fleet Life Expenditure |