| Acronym | Definition |
|---|
| FLL | First Lego League (partnership between FIRST and the LEGO Company) |
| FLL | Female Luer Lock |
| FLL | Functional Leg Length (anatomy) |
| FLL | Foreign Languages & Literatures (various schools) |
| FLL | Flux Locked Loop |
| FLL | Foxpro Link Library |
| FLL | Fixed Loss Loop |
| FLL | Faculty Liaison Librarian (various organizations) |
| FLL | First-Line Leader |
| FLL | Family Love Letter (estate planning document) |
| FLL | Frequency Lock Loop (Datum) |
| FLL | Flux Locked Loop (also see Phase Locked Loop, PLL) |
| FLL | Fixed Loss Loop (modem information) |
| FLL | Fountain of Love and Life (Chinese Catholic TV program) |
| FLL | Full Load Level |
| FLL | Fort Lauderdale, FL, USA - Fort Lauderdale/Hollywood International Apt (Airport Code) |