| Acronym | Definition |
|---|
| PII | Personally Identifiable Information |
| PII | Phase II (clinical studies) |
| PII | Pentium 2 |
| PII | Performance Improvement Initiative (various organizations) |
| PII | Patient Identifiable Information |
| PII | Pentium II Processor (Intel) |
| PII | Plug It In |
| PII | Pacific Invasives Initiative (Auckland, New Zealand) |
| PII | Persatuan Insinyur Indonesia |
| PII | Public Interest Institute (Mount Pleasant, IA) |
| PII | Program Integrated Information |
| PII | Pasteur Institute of India |
| PII | Pershing II (missile) |
| PII | People International Inc. (musical performance) |
| PII | Plasma Ion Implantation |
| PII | Profit Improvement Initiatives |
| PII | Publication Item Identifier |
| PII | Public and Institutional Interactions |
| PII | Preliminary Item Identifier (NASA) |
| PII | Procurement Instrument Identification/Identifier |
| PII | Performance Interconnect, Incorporated |