| Acronym | Definition |
|---|
| FRL | Fixed Rate Loan |
| FRL | Friesland |
| FRL | Filter, Regulator, Lubricator (pneumatics technology) |
| FRL | Field Research Laboratory (India) |
| FRL | Full Reservoir Level (hydroelectricity) |
| FRL | Family Research Laboratory (University of New Hampshire) |
| FRL | Fire Resistance Level (grading for building products) |
| FRL | Forest Reference Level (climate change) |
| FRL | Fraeulein (German: Miss) |
| FRL | Fiber Reinforced Laminate (paneling) |
| FRL | Fractional Reserve Lending (finance) |
| FRL | Fire Research Laboratory (US Bureau of Alcohol, Tobacco, Firearms and Explosives) |
| FRL | Frame Relay Link |
| FRL | Foundation for Rural Living (Canada) |
| FRL | Finished Road Level (civil engineering) |
| FRL | French Radio London (radio station; UK) |
| FRL | Fantasy Racing League |
| FRL | Former Regime Loyalists (Iraq) |
| FRL | Free Range Librarian (personal blog) |
| FRL | Flight Refueling Limited (now Cobham PLC; UK) |
| FRL | Free & Reduced Lunch |
| FRL | Frequently Requested Listings (Automated Directory Assistance & Speech-enabled Applications) |
| FRL | Feyenoord Rotterdam Lyrics |
| FRL | Franchise Recruiters, Ltd. |
| FRL | Frame Representation Language (MIT) |
| FRL | Facility Restriction Level |
| FRL | Future Remnant Liver (hepatectomy) |
| FRL | Fuselage Reference Line |
| FRL | Failure Rate Level (standard for electronic components) |
| FRL | Fusion Rocket Launcher |
| FRL | Finland-Russia Line (fiber optic) |
| FRL | Finished Roof Level |
| FRL | Feltman Research Labs. |
| FRL | Functional Requirements Letter |
| FRL | Florida Right to Life Committee, Inc. |
| FRL | Filter, Air Roll |
| FRL | Fiberglass Reinforced Lining (peramenent spa and hot tub refinishing) |