FSK
- FSK (band)
- Federal Counterintelligence Service
- Fiskerton railway station
- Forskolin
- Forsvarets Spesialkommando
- Fort Scott Municipal Airport
- Francis Scott Key High School
- Freiwillige Selbstkontrolle der Filmwirtschaft
- Frequency-shift keying
- Friends School Kamusinga
- Key Bridge (disambiguation)
- Kosovo Security Force