| PIIA | Pakistan Institute of International Affairs 
| Others |
| PIIA | Peace Initiative International for Africa
| Others |
| PIIA | Performance Improvement In Action
| Others |
| PIIA | Post Inspiratory Inspiratory Activity
| Others |
| PIIA | Practitioner with the Chartered Institute of Internal Auditors
| Others |
| PIIA | Presidents Island Industrial Association
| Others |
| PIIA | Process Industrial It and Automation
| Others |
| PIIA | Proprietary Information and Inventions Agreement
| Others |
| PIIA | Proprietary Information and Inventions Assignment
| Others |
| PIIA | Proprietary Information and Inventions Assignment Agreement
| Others |
| PIIA | Public Interest Incorporated Association
| Others |