| Abbreviation | Definition |
|---|---|
| NPI | Neighborhood Preservation Inc |
| NPI | Neighborhood Progress Inc |
| NPI | Neighborhood Properties Inc |
| NPI | Network Performance Inc |
| NPI | Neuro-Psychiatric Institute |
| NPI | Noise Pollution, Inc. |
| NPIC | Natural Polymer International Corporation |
| NPIC | North Poudre Irrigation Company |
| NPK | Noordelijk Pinkster Kamp |
| NPLC | New Paradigm Learning Corporation |
| NPM | Northwest Physicians Mutual Insurance Company |
| NPMO | Nevada Precious Metals Operations |
| NPNC | Niue Philatelic and Numismatic Company |
| NPO | Nicastro Piscopo Ogrin, Attorneys at Law |
| NPO | Non Profit Organization |
| NPPC | Nestle Purina PetCare Company |
| NPPI | No Perfect People Inc |
| NPPI | Non-Profit Photographic Institute Foundation, Inc |
| NPPI | Northern Power Products Inc |
| NPPL | Northern Pipeline Projects Ltd |