- Pasteur Network (Réseau International des Instituts Pasteur)
- Pengeinstitutternes Købe- og Kreditkortselskab [Copenhagen]
- Petrozavodsk State University [Petrozavodsk]
- Philips Research Europe [The Netherlands]
- Plekhanov Russian University of Economics [Moscow]
- Plymouth University
- Polish Information Processing Society - Polskie Towarzystwo Informatyczne
- Politecnico di Milano [Milan]
- Politecnico di Torino = Polytechnic of Turin
- Polytechnic Institute of Porto
- Polytechnic Museum [Moscow]
- Polytechnic institute of New York University
- Pontificia Universidad Católica del Perú = Pontifical Catholic University of Peru
- Pontificia Universidad Javeriana
- Prague University of Economics and Business
- Princeton University
- Progetto HMR
- Protocols and softwares for very high-performance network