| Acronym | Definition |
|---|
| PHIA | Personal Health Information Act (Canada) |
| PHIA | Pennsylvania Highway Information Association (Harrisburg, PA) |
| PHIA | Professional Healthcare Institute of America (Louisville, KY) |
| PHIA | Psychological Harassment Information Association (est. 2003) |
| PHIA | Plumbing and Heating Industry Alliance (United Kingdom) |
| PHIA | Paranormal Haunting Investigation Association |
| PHIA | Polish Historical Institute in Australia |
| PHIA | Pennsylvania Homicide Investigators' Association (est. 1992) |
| PHIA | Pasteurella Haemolytica by Indirect Agglutination (pathology) |
| PHIA | Passive Hemagglutination Inhibition Assay |