- PALUNO - The Ruhr Institute for Software Technology
- PFP CyberSecurity
- PRES Université de Toulouse
- PROVUS A MasterCard Company
- PSA Group
- PSG College of Technology [Coimbatore]
- Pace University
- Palo Alto Research Center
- Pamukkale University
- PayPal [Scottsdale, Arizona]
- Peking University [Beijing]
- Pengcheng Laboratory = Peng Cheng Laboratory [Shenzhen]
- Penn State System
- Pennsylvania Commonwealth System of Higher Education (PCSHE)
- Pennsylvania State University
- Peraton Labs
- Petru Maior University
- Philipps Universität Marburg = Philipps University of Marburg
- Philips Research Europe [The Netherlands]
- Philips Research Laboratories [Eindhoven]
- Piksel
- Plymouth University
- Politecnico di Milano [Milan]
- Politecnico di Torino = Polytechnic of Turin
- Polska Akademia Nauk = Polish Academy of Sciences = Académie polonaise des sciences
- Polynomial Systems
- Polytech Nice-Sophia
- Pontificia Universidad Javeriana
- Postgraduate School of Engineering Management [Johannesburg]
- Princess Nourah Bint Abdulrahman University
- Princeton University
- Privacy Models, Architectures and Tools for the Information Society
- Procure Ai
- Proficiency Labs International
- Proof techniques for security protocols
- Pukyong National University
- Purdue University [West Lafayette]