| Acronym | Definition |
|---|
| PNN | Probabilistic Neural Network |
| PNN | Persian News Network (Voice of America) |
| PNN | Personal News Network (website) |
| PNN | Pepinnini Minerals (Australia) |
| PNN | Poor News Network (website) |
| PNN | Police National Network (UK) |
| PNN | Polynomial Neural Network (mathematics) |
| PNN | Pesticide Notification Network (Washington State University) |
| PNN | Photo News Network |
| PNN | Pay News Network (San Antonio, TX) |
| PNN | Profesor No Numerario |
| PNN | Princeton News Network (Princeton University; New Jersey) |
| PNN | Pulsed Neutron Neutron |
| PNN | Positive News Network (Cary, IL) |
| PNN | Plokta News Network (science-fiction fansite) |
| PNN | Pharmacotherapy News Network (journal) |
| PNN | Pb(Ni1/3Nb2/3)O3 (Lead Nickel Niobate) |
| PNN | Pride Nation Network (gay and lesbian media website) |
| PNN | Planet2025 News Network (internet news service) |
| PNN | Phillips Neighborhood Network (Minneapolis, MN) |
| PNN | Puppet News Network |
| PNN | Plausible Neural Network |
| PNN | Panther News Network |
| PNN | Professional Nursing Network (New York, NY) |
| PNN | Paranormal News Network (podcast) |
| PNN | Lead Nickel Niobate (Pb(Ni1/3Nb2/3)O3) |
| PNN | Pins 'N' Needles |
| PNN | Photo-Novel News (Star Wars) |
| PNN | Prediction-Based Nearest Neighbor |
| PNN | Precision Nutrition Network |
| PNN | Part Number Nomenclature |
| PNN | Psychodrama Network News (newsletter) |
| PNN | Pakistan News Network |
| PNN | Petroleum News Net (website) |
| PNN | Private Newsstand Network |
| PNN | Private's News Network |
| PNN | Pulmonary Necrobiotic Nodule |