| Acronym | Definition |
|---|
| PHI | Protected Health Information (HIPAA Administrative Simplification Provision) |
| PHI | Philosophy |
| PHI | Personal Health Information |
| PHI | Patient Health Information |
| PHI | Private Health Insurance |
| PHI | Public Health Institute |
| PHI | Pepco Holdings, Inc. (Newark, DE) |
| PHI | Programa Hidrológico Internacional (Spanish: International Hydrological Program) |
| PHI | Paraprofessional Healthcare Institute |
| PHI | Pre-Harvest Interval (pesticide use) |
| PHI | Physical Electronics |
| PHI | Public Health Investigation (various locations) |
| PHI | Permanent Health Insurance |
| PHI | Public Health Informatics |
| PHI | Post-Polio Health International |
| PHI | Packard Humanities Institute |
| PHI | Piedmont Heart Institute (Atlanta, GA) |
| PHI | Petroleum Helicopters Inc |
| PHI | Public Health Inspector (Canada) |
| PHI | Public Humanities Initiative (University of California, Santa Barbara) |
| PHI | Public Health Intelligence |
| PHI | Platform High |
| PHI | Population Health Impact |
| PHI | Personal History Interview (life/health underwriting) |
| PHI | Provincial Homelessness Initiative (British Columbia, Canada) |
| PHI | Pharmacie Humanitaire Internationale (French: Humanitarian International Pharmacy) |
| PHI | Packet Handler Interface |
| PHI | pre-harvest inspection (timber harvesting) |
| PHI | Photonic Hit Indicator |
| PHI | Precision Hardware, Inc. (manufacturers of exit hardware) |
| PHI | Process Hat Industries, PLLC (consulting engineers) |
| PHI | Pineiro, Brazil (Airport Code) |
| PHI | Phosphoexose Isomerase |
| PHI | Porter Hetu International |
| PHI | Pacific Health Information Network |