BFK may refer to
Battelle for Kids, a not-for-profit organization BFK (song), by rapper Freddie Gibbs BFK (Swiss Air Force), short for Berufsfliegerkorps BFK (British Rail coach designation) BFK (FAA airport code) BFK (IATA airport code)
See also Borgward Kolibri, a helicopter design with the official designation "Borgward BFK-1 Kolibri"