| PNNA | Pacific Northwest Newspaper Association | 太平洋西北报业协会 |
| PNNA | Pacific Northwest Numismatic Association | 太平洋西北钱币协会 |
| PNNA | Plan Nacional de NavegaciÓn AÉrea (Peru) | Plan Nacional de NavegaciÓn AÉrea (Peru) |
| PNNA | Parque Nacional Natural Amacayacu | 国家自然公园Amacayacu |
| PNNA | Pairwise Nearest Neighbor Algorithm | 成对最近邻算法 |
| PNNA | Poly (N-Naphtylaniline) | 聚（N-萘二苯胺） |
| PNNA | Penn Engineering & Manufacturing Corporation Class A | 佩恩工程、制造企业甲级 |