PFA
- List of email subject abbreviations
- PFA Footcare Association (Canadian Chapter)
- PFAS
- Pacific Film Archive
- Pahang FA
- Palestinian Football Association
- Parafluoroamphetamine
- Paraformaldehyde
- People for Animals
- Perak FA
- Perfluoroalkoxy alkane
- Performic acid
- Pickleball Federation of the Americas
- Police Federation of Australia
- Policía Federal Argentina
- Popular Flying Association
- Popular Front of Azerbaijan
- Portable Format for Analytics
- PostScript fonts
- Predictive failure analysis
- Prime-factor FFT algorithm
- Probabilistic finite automaton
- Professional Footballers Australia
- Professional Footballers' Association
- Professional Fraternity Association
- Proper forcing axiom
- Protection from abuse
- Psychological first aid
- Pulverised fuel ash