- Planetary and Space Sciences Research Institute [Milton Keynes]
- PLANETO - LATMOS
- Polar Research Institute of China
- Pôle Planétologie du LESIA
- Politecnico di Milano [Milan]
- Polska Akademia Nauk = Polish Academy of Sciences = Académie polonaise des sciences
- PRES Université Nantes Angers Le Mans
- Proudman Oceanographic Laboratory