| PIES | Penning ionization electron spectrum 
| Others |
| PIES | Persona Iriz Exora and Saga
| Others |
| PIES | Personal Intellectual Emotional and Social
| Others |
| PIES | Photographic Image Editing System
| Others |
| PIES | Physical Intellectual Emotion and Spiritual
| Others |
| PIES | Physical Intellectual Emotional and Social
| Others |
| PIES | Physical Intellectual Emotional and Spiritual
| Others |
| PIES | Product Information Exchange Standard
| Others |
| PIES | Program Information and Enrolment Session
| Others |
| PIES | Project Independence Evaluation System
| Others |