| F&LS | Fire and Life Safety 
| Others |
| FLS | F***ing Leicester Show
| Others |
| FLS | Fair Labor Standards
| Others |
| FLS | Fame Lame And Shame
| Others |
| FLS | Fame Login Server
| Others |
| FLS | Fame, Lame, and Shame
| Others |
| FLS | Family Life Surveys
| Others |
| FLS | Farmworker Legal Services
| Others |
| FLS | Fashion Learning School
| Others |
| FLS | Fast Lane Service
| Others |
| FLS | Fast Local Search
| Others |
| FLS | Fat Lazy and Stupid
| Others |
| FLS | Fatigue Limit State
| Others |
| FLS | Feasible Linear Subsystem
| Others |
| FLS | Feather Larson and Syndhorst
| Others |
| FLS | Feedback Locating System
| Others |
| FLS | Fellow of the Linnean Society
| Others |
| FLS | Fellow of the Literary Society
| Others |
| FLS | Fetid Lame Service
| Others |
| FLS | Fibroblast like synoviocytes
| Others |
| FLS | Fictitious LTER Site
| Others |
| FLS | Field Landing Strip
| Others |
| FLS | Field level security
| Others |
| FLS | Field Loadable Software
| Others |
| FLS | Final Literacy Straw
| Others |
| FLS | Fire Life Safety
| Others |
| FLS | First Last Stride
| Others |
| FLS | First Level Support
| Others |
| FLS | First Line Supervisor
| Others |
| FLS | First Look Survey
| Others |
| FLS | Fixed Length Structure
| Others |
| FLS | Fixed Line Services
| Others |
| FLS | Fixed Line Substitution
| Others |
| FLS | Fleet Special
| Others |
| FLS | Flexible Learning Spaces
| Others |
| FLS | Flexible Legal Solutions
| Others |
| FLS | FLight Surgeon
| Others |
| FLS | Flinders Island, Tasmania, Australia
| Others |
| FLS | Florida Legal Services
| Others |
| FLS | Floridavue Listing Service
| Others |
| FLS | Flu Like Symptoms
| Others |
| FLS | Fluid Level Sensor
| Others |
| FLS | Folklore Society
| Others |
| FLS | Foreign Language Services
| Others |
| FLS | Foreign Language Spanish
| Others |
| FLS | Forensic Light Source
| Others |
| FLS | Forever Living Suckafree
| Others |
| FLS | Forward Load Space
| Others |
| FLS | Forward Logistic Site
| Others |
| FLS | Forward Looking Sonar
| Others |
| FLS | Fracture Liaison Service
| Others |
| FLS | Fracture Liaison Services
| Others |
| FLS | Frame Level Scheduler
| Others |
| FLS | Free Line Signal
| Others |
| FLS | Free list suspended
| Others |
| FLS | Freehold Land Society
| Others |
| FLS | Freightliner Sprinter
| Others |
| FLS | Front Lift System
| Others |
| FLS | Front Loading System
| Others |
| FLS | Front-Line States
| Others |
| FLS | Fu Lu Shou
| Others |
| FLS | Fuel Level Sensor
| Others |
| FLS | Full Sized Sedan
| Others |
| FLS | Fulton Leadership Society
| Others |
| FLS | Functional Living Skills
| Others |
| FLS | Functioning Life Skills
| Others |
| FLS | Fundamentals Of Land Surveying
| Others |
| FLS | Fundamentals of Laparoscopic Surgery
| Others |
| FLS | Funding for Lending Scheme
| Others |
| FLS | Funny Little Stance
| Others |
| FLS | Further Literacy Support
| Others |
| FLS | Fuzzy Logic System
| Others |