FSR
- Federation of Scouts of Russia
- FidelityFX Super Resolution
- Financial Services Roundtable
- Finite-state recognizer
- First ScotRail
- First Strike Ration
- Fisheye State Routing
- Five-second rule (basketball)
- Flood Studies Report
- Floor space ratio
- Flower, Sun, and Rain
- Folk Soul Revival
- Force-sensing resistor
- Forces of Satan Records
- Forest Service Road
- Forestburg Scout Reservation
- Former Soviet republics
- Fort Smith Railroad
- Fox Sports Racing
- Fox Sports Radio
- Fractional synthetic rate
- Free spectral range
- Fresh Sound
- Fresh Sounds Records
- Friends of Soviet Russia
- Full Surface Records
- Full-service restaurant
- Yle FSR