| Poly Hyrdroxy Acid | Academic & Science |
| Pharyngealization | Academic & Science |
| Prince Hall Affiliated | Academic & Science |
| Potentially Hazardous Asteroid | Academic & Science |
| Prospect Hill Academy | Academic & Science |
| Phan Rang | Airport Code |
| Public Holdings (Australia) Ltd | Business |
| Process Hazard Analysis | Business |
| Pharmacia Corporation | Business |
| Packowski Heinritz Associates | Business |
| Pennsylvania Homecare Association | Community |
| Prince Hall Association | Community |
| Peoria Housing Authority | Community |
| Public Housing Authorities | Community |
| Parks and Horticulture Authority | Community |
| People Having AIDS | Community |
| Public Housing Agencies | Community |
| Pacific Health Association | Community |
| Pearl Harbor Associates | Community |
| Pulmonary Hypertension Association | Community |
| Professional Horsemen's Association | Community |
| Phala Network | Cryptocurrency |
| Pulse Height Analysis | Electronics |
| Prince Hall Affiliate | General |
| Peripheral Hear Action | General |
| Progressive Hammer Action | General |
| Premium High Availability | General |
| Plan for a Healthier Allegheny | General |
| Produce Handling Assurance | General |
| Potentially Harmful Applications | General |
| Pyeong Hwa Automotive | General |
| Phaeton | General |
| Provincial Highway Administration | General |
| Poly- Hydroxy Alkanoate | General |
| Partnership For A Healthier America | General |
| Port of Houston Authority | Governmental |
| Public Health Advisory | Governmental |
| Public Health Advisor | Governmental |
| Public Health Assessment | Governmental |
| Pakistan Housing Authority | Governmental |
| Portland Housing Authority | Governmental |
| Physician Hospital Alliance | Governmental |
| Portsmouth Housing Authority | Governmental |
| Public Housing Agency | Governmental |
| PATHARIA | Indian Railway Station |
| Perfectly Hopeless A** | Internet |
| Pediatric Healthcare Associates | Medical |
| Periodic Health Assessment | Medical |
| Purdue Healthcare Advisors | Medical |
| Population Health Alliance | Medical |
| Passive Haemagglutination Assay | Medical |
| Pelger-Hüet anomaly | Medical |
| Personal Health Assessment | Medical |
| phytohaemagglutinin | Medical |
| Posterior Hypothalamic Area | Medical |
| posthypnotic amnesia | Medical |
| primary hyperaldosteronism | Medical |
| pseudohypoaldosteronism | Medical |
| Public Health Agency | Medical |
| Public Health Alliance (incorporated into UKPHA) | Medical |
| Public Health Association | Medical |
| Pulse-Height Analyser | Medical |
| Post-development Health Assessment | Medical |
| Physician Hospitals Of America | Medical |
| Personal Health Applications | Medical |
| Preventive Health Assistance | Medical |
| Periodic Health Assessments | Medical |
| Public Health Action | Medical |
| Public Health Assessments | Medical |
| Preventive Health Assessment | Medical |
| Peripheral Heart Action | Medical |
| Preliminary Hazard Analysis | Military and Defence |
| Physical Health Assessment | Military and Defence |
| Public Housing Authority | Real Estate |
| Providence Housing Authority | Real Estate |
| Piedmont Housing Alliance | Real Estate |
| Philadelphia Housing Authority | Real Estate |
| Plant Health Australia | Regional |
| Phan Rang, Vietnam | Regional |
| Preliminary Hazard Analyses | Space Science |
| Pulse Height Analyzer | Space Science |
| Potentially Hazardous Asteroids | Space Science |
| Prowler Hockey Assoc | Sports |
| Pacific Hockey Association | Sports |
| Peterborough Hockey Association | Sports |
| Palomino Horse Association | Sports |
