| Acronym | Definition |
|---|
| NPSO➣Native Plant Society of Oregon |
| NPSO➣Nassau Pops Symphony Orchestra (New York) |
| NPSO➣National Programme Support Office (Pakistan) |
| NPSO➣North Penn Symphony Orchestra (Lansdale, PA) |
| NPSO➣Non-Product Specific Offer |
| NPSO➣Non-Parametric Second-Order |
| NPSO➣National Pink Space Operations (gaming) |