| Acronym | Definition |
|---|
| PNAA➣Philippine Nurses Association of America |
| PNAA➣Pacific Northwest Alpaca Association |
| PNAA➣Pacific Northwest Aerospace Alliance (Seattle, WA) |
| PNAA➣Piano Nazionale Alimentazione Animale (Italian: National Plan on Animal Nutrition; Minister of Health) |
| PNAA➣Preconcentration Neutron Activation Analysis (nuclear chemistry) |