PNN

PNN may refer to:


 * National Natural Parks System (Colombia) (Unidad Administrativa Especial del Sistema de Parques Nacionales Naturales de Colombia PNN)
 * Parliamentary and News Network, Australia
 * Princeton Municipal Airport (Maine), USA (by IATA code)
 * Probabilistic neural network, in machine learning
 * Pinin, a protein encoded by the PNN gene
 * Hagahai language (ISO 639 code: pnn)
 * VOA-PNN, Voice of America Persian News Network
 * Perineuronal net, in the brain
 * Potsdamer Neueste Nachrichten, newspaper in Potsdam, Germany