| NAPPA | Nail Assessment in Psoriasis and Psoriatic Arthritis 
| Others |
| NAPPA | National Association of Public Pension Attorneys
| Others |
| NAPPA | National Association Preservation/Privies/America
| Others |
| NAPPA | North American Pet Pig Association
| Others |
| NAPPA | Northern American Phreakers Piraters Association
| Others |
| NAPPA | Nucleic Acid Programmable Protein Array
| Others |