| PII | Pacific Invasives Initiative 
| Others |
| PII | Pasteur Institute of India
| Others |
| PII | Peace Islands Institute
| Others |
| PII | Pentium 2
| Others |
| PII | Pentium II microprocessor
| Others |
| PII | Pentium II processor
| Others |
| PII | People International, Inc.
| Others |
| PII | Permanency Innovation Initiative
| Others |
| PII | Permanency Innovations Initiative
| Others |
| PII | Permanent Interface Identifier
| Others |
| PII | Persatuan Insinyur Indonesia
| Others |
| PII | Pershing II
| Others |
| PII | Personal Identity Information
| Others |
| PII | Personally Identifiable Information
| Others |
| PII | Personally Identifying Information
| Others |
| PII | Pharmaceutics International Inc
| Others |
| PII | Phillip Field, Fairbanks, Alaska
| Others |
| PII | Ping If Interested
| Others |
| PII | Pipeline Integrity International
| Others |
| PII | Plug It In
| Others |
| PII | Polaris Industries
| Others |
| PII | Polaris Industries Inc
| Others |
| PII | Pork Industry Institute
| Others |
| PII | Pork Industry Institute, Texas Tech University
| Others |
| PII | Pre-Incident Indicators
| Others |
| PII | Princeton in Ishikawa
| Others |
| PII | Printing Industry of Illinois/Indiana
| Others |
| PII | Privacy Identity Innovation
| Others |
| PII | Procurement Instrument Identification
| Others |
| PII | Professional Indemnity Insurance
| Others |
| PII | Professional Innovations, Inc.
| Others |
| PII | Professional Investigators International
| Others |
| PII | Program Image Inspector
| Others |
| PII | Program Integrated Information
| Others |
| PII | Public Interest Immunity
| Others |
| PII | Publisher Item Identifier
| Others |
| PII | Publishers Item Identifier
| Others |