| Acronym | Definition |
|---|
| FSL➣Florida State League |
| FSL➣French as a Second Language |
| FSL➣Forensic Science Laboratory (various organizations) |
| FSL➣Firstsource Solutions Ltd. (various locations) |
| FSL➣Food Security and Livelihood (hunger prevention) |
| FSL➣Finlands Svenska Lärarförbund (Swedish: Finnish Swedish Teachers; union) |
| FSL➣Fonds de Solidarité Logement (French: Housing Solidarity Fund) |
| FSL➣Fast Simplex Link |
| FSL➣Foundstone Scripting Language |
| FSL➣Forecast Systems Laboratory (NOAA) |
| FSL➣Federal, State, Local |
| FSL➣Fluid Science Laboratory |
| FSL➣Fidelity Security Life (insurance; Kansas City, MO) |
| FSL➣Foundation for Senior Living (Phoenix, AZ) |
| FSL➣Full Supply Level |
| FSL➣Free Space Loss (propagation loss) |
| FSL➣Fast Simplex Link (uni-directional point-to-point communication channel bus) |
| FSL➣Food Safety Laboratory (various locations) |
| FSL➣FMRIB Software Library |
| FSL➣Fiscal Services Limited (Jamaica) |
| FSL➣French As Second Language |
| FSL➣Fleet Support Limited (Portsmouth, UK) |
| FSL➣Fire Services Levy (insurance, Australia) |
| FSL➣Full Service Leasing |
| FSL➣Flight Simulation Laboratory (various organizations) |
| FSL➣Finite State Language |
| FSL➣Furniture Symbol Library (space planning software) |
| FSL➣Foundstone Scripting Language (programming) |
| FSL➣First Sea Lord (British Navy) |
| FSL➣Full Stop Landing |
| FSL➣Foreign Secretary Level (international talks) |
| FSL➣Flight System Laboratory |
| FSL➣Framework Standard Library (software) |
| FSL➣Forward Stocking Location |
| FSL➣Field Stocking Location |
| FSL➣Full Service Level (FAA) |
| FSL➣Fragg Show Lübeck (gaming clan) |
| FSL➣Financial Services Licensee |
| FSL➣Frame Sync Length |
| FSL➣Forms Source Language |
| FSL➣Financial Services Lab |
| FSL➣Forward Supply Location |
| FSL➣Funded Staffing Level |
| FSL➣Ferrite Single Line |
| FSL➣Five Star Logistics Ltd. (Comet Shipping Agencies Nigeria Ltd.) |
| FSL➣Flip Side Legends |
| FSL➣Future Sustainability Leadership (Australia) |
| FSL➣Frank-Starling Law |
| FSL➣Forward Staging Location |