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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