| Acronym | Definition |
|---|
| APPI | American Psychiatric Publishing, Inc. |
| APPI | American Psychiatric Publishing Inc. |
| APPI | Advanced Peer to Peer Internetworking |
| APPI | American Psychiatric Press, Inc. |
| APPI | Atmospheric Pressure Photoionization |
| APPI | Advanced Peer-to-Peer Internetworking |
| APPI | Advanced Plant Pharmaceuticals Inc. |
| APPI | Associação Portuguesa de Professores de Inglês |
| APPI | Affiliated Power Purchasers International, LLC |
| APPI | Animal Protein Producers Industry |
| APPI | Australian Pulp and Paper Institute |
| APPI | Accelerator and Particle Physics Institute |
| APPI | Agência Paranaense de Propriedade Industrial |
| APPI | Asian Petroleum Price Index |
| APPI | Associated Professional Photographers of Illinois |
| APPI | Asosiasi Produsen Pupuk Indonesia (Association of Indonesia Fertilizer Producers) |
| APPI | Association de Promotion de la Profession Infirmière |
| APPI | Atlantic Precision Products Inc. |
| APPI | International Association for the Promotion and Protection of Private Foreign Investments |
| APPI | Advanced Program-to-Program Internetworking |
| APPI | Austrian Pension Performance Index |
| APPI | Acid Precipitated Protein Isolates |
| APPI | Association Paulista Pro Interlingua |