FNN may refer to:
- False nearest neighbor algorithm
- Farnborough North railway station, in England
- Feedforward neural network
- Financial News Network, a defunct American television network
- Flat neighborhood network, a type of computer network
- Fox News Network, U.S. cable news network
- Fuji News Network, a Japanese television network
- Fuzzy neural network
- Fake News Network, a mockery used for CNN primarily during and a while after the 2016 United States presidential election
This disambiguation page lists articles associated with the title FNN.
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