FLD
- FLDS
- Farmer's lung
- Fatty liver disease
- Fauldhouse railway station
- Fazio–Londe disease
- Federalists and Liberal Democrats
- Ferroelectric liquid crystal display
- Field (disambiguation)
- Fisher's linear discriminant
- Fluid (disambiguation)
- Fond du Lac County Airport
- Forming limit diagram
- Front for the Liberation of Djibouti
- Liberal Democratic Foundation
- Palringo