| Acronym | Definition |
|---|
| NPIA | National Policing Improvement Agency (UK) |
| NPIA | National Police Improvement Agency (UK) |
| NPIA | Nacionalnega Programa Izgradnje Avtocest (Slovenian: National Motorway Construction Program) |
| NPIA | Non-Profit Institutions Act (Robinson-Patman Act amendment) |
| NPIA | Nine Princes in Amber (Roger Zelazny novel and computer game) |
| NPIA | Nelson Property Investors' Association (New Zealand) |
