FFN may refer to:
For the Freedom of Nations!, an anti-colonial organization FanFiction.Net, a fan fiction archive site Fast Food Nation, a book by Eric Schlosser Fédération Française de Natation, the French Swimming Federation Fetal fibronectin Free French Navy Friend Finder Networks, a social media website Full frontal nudity Radio ffn, a German radio channel "Full Frontal Nudity", an episode of Monty Python's Flying Circus Flip-Flop Nation, an exclamatory used when one wears flip-flop sandals Feedforward neural network, a type of artificial neural network
F.F.N., romanian band