| PNI | Pacific Neuropsychiatric Institute 
| Others |
| PNI | Pacific Neuroscience Institute
| Others |
| PNI | Pacific Northwest Index
| Others |
| PNI | Pacific Northwest Instruments
| Others |
| PNI | Paid No Issue
| Others |
| PNI | Partai Nasional Indonesia
| Others |
| PNI | Participatory Narrative Inquiry
| Others |
| PNI | Peripheral nerve injury
| Others |
| PNI | Perl Node Interface
| Others |
| PNI | Perserikatan Nasional Indonesia
| Others |
| PNI | Personal Names Index
| Others |
| PNI | Physical Networking Infrastructure
| Others |
| PNI | Pohnpei, Caroline Islands, Pacific Ocean
| Others |
| PNI | Pollinator Network Initiative
| Others |
| PNI | Positive Negative and Interesting
| Others |
| PNI | Preclinical Nuclear Imaging
| Others |
| PNI | Prescott New Instructions
| Others |
| PNI | Prescott New Instuctions
| Others |
| PNI | Princeton Neuroscience Institute
| Others |
| PNI | Prognostic Nutrition Index
| Others |
| PNI | Prognostic Nutritional Index
| Others |
| PNI | Programme Network Institutes
| Others |
| PNI | Programs of National Interest
| Others |
| PNI | Progress Not Individual
| Others |
| PNI | Promise Neighborhoods Initiative
| Others |
| PNI | Promise Neighborhoods Institute
| Others |
| PNI | Property Network International
| Others |
| PNI | Proportion of Natural Influence
| Others |
| PNI | Proprietary Nutritionals Inc
| Others |
| PNI | Provisional Node Identifier
| Others |
| PNI | Psychiatric Neuro- Imaging
| Others |
| PNI | Psycho Neuro Immunology
| Others |
| PNI | Psycho-Neuro Immunology
| Others |
| PNI | PsychoNeuro Immunology
| Others |
| PNI | Psychoneuroimmunology and it
| Others |