| 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) |