FK or fk may refer to:
In arts and entertainment:
* Flyer Killer, fictional automated robots in the Terminator (franchise), ''Terminator'' film franchise.
* Fox Kids, a former American children's television programming block.
* Funky Kong, a video game character.
Place:
* FK postcode area, UK, centred on Falkirk in Scotland.
* Falkland Islands, FIPS PUB 10-4 territory code and ISO 3166 digram
**.fk, country code top-level domain (ccTLD) for the Falkland Islands.
Other uses:
* First aid kit
* First Corridor rail coach
* Football team, Football Club, abbreviated "FK" in Slavic and Balkan countries
* Foreign key, in database design
* Forward kinematics, in robotics and animation, the use of kinematic equations to find the position of an articulated object
* Fuck, an English-language vulgarity
* Africa West Airlines (IATA airline designator FK)
* Finders, keepers, Finders Keepers
* kinetic friction, in physics, mechanics
{{disambiguation