- Pacific Northwest National Laboratory
- Pacte, Laboratoire de sciences sociales
- Palais de la Découverte
- Paléocéanographie
- Paneureka
- Panorama Pathways [Boulder]
- Parallélisme, Réseaux, Systèmes, Modélisation
- Parc national de Port Cros
- Partenaires INRAE
- Partenaires IRSTEA
- Particle Chemistry Department [Mainz]
- Pasteur Labs & ISI
- Pasteur Network (Réseau International des Instituts Pasteur)
- Paul Scherrer Institute
- Payame Noor University
- Payerne Aerological Station
- PBL Netherlands Environmental Assessment Agency
- Pearson Chemical Laboratory
- Peking University [Beijing]
- Penn State Department of Geosciences
- PennState Meteorology Department
- Penn State System
- Pennsylvania State University
- People's Friendship University of Russia [Moscow] = Rossijskij universitet družby narodov [Moskva]
- Perception, Interaction, Robotique sociales
- Performance et Qualité des Algorithmes Numériques
- Peter the Great St. Petersburg Polytechnic University
- Photonique Fibre et Sources Cohérentes
- Physical and Theoretical Chemistry Laboratory [Oxford]
- Physical Research Laboratory [Ahmedabad]
- PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX
- Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522
- Physics Department [Lincoln]
- Physics Department [Stanford]
- Physics Department [UNB]
- Physics Institute [Bern]
- Physikalisch-Chemisches Institut [Heidelberg]
- Physikalisches Institut [Bayreuth]
- Physikalisches Institut [Bern]
- Physikalisch-Meteorologisches Observatorium Davos|World Radiation Center
- Physikalisch-Technische Bundesanstalt [Berlin]
- Physikalisch-Technische Bundesanstalt [Braunschweig]
- Physik Department [Garching]
- Physique des interactions ioniques et moléculaires
- Physique des plasmas
- Physique solaire
- Picomole Instruments Inc.
- PI-DSMC software package
- Pinhead Institute
- Pioneer Research Center for Climate and Earth Science
- Plancius Research LLC
- Planetary and Space Science Centre
- Planetary and Space Sciences [Milton Keynes]
- Planetary and Space Sciences Research Institute [Milton Keynes]
- Planetary Exploration Research Center [Chiba]
- Planetary Geodynamics Laboratory [Greenbelt]
- Planetary Geosciences Institute [Knoxville]
- Planetary Plasma and Atmospheric Research Center [Sendai]
- Planetary Research Centre [Sydney]
- Planetary Science Institute [Tucson]
- Planetary Science Laboratory [Ann Arbor]
- Planet Federal Inc.
- PlanetiQ
- PLANETO - LATMOS
- Planetology and Environments from Ground Astrometry and Space Exploration
- Plant Ecology Research Laboratory
- Plasmas Réactifs Hors Equilibre
- Plateforme d'Intégration et de Tests
- Plymouth Marine Laboratory
- P. N. Lebedev Physical Institute of the Russian Academy of Sciences [Moscow]
- Polar Geophysical Institute of Russian Academy of Sciences
- Polar Research Institute of China
- Pôle de recherche pour l'organisation et la diffusion de l'information géographique
- Pôle instrumental
- Pôle Planétologie du LESIA
- Politecnico di Milano [Milan]
- Politecnico di Torino = Polytechnic of Turin
- Polska Akademia Nauk = Polish Academy of Sciences = Académie polonaise des sciences
- Polytechnic Institute of Guarda
- Polytechnic University of Marche | Università Politecnica delle Marche
- Pontificia Universidad Católica de Chile
- Pontificia Universidad Católica del Perú = Pontifical Catholic University of Peru
- Pontificia Universidad Católica de Valparaíso
- Portland State University [Portland]
- Portuguese Institute for Sea and Atmosphere
- Potsdam Institute for Climate Impact Research
- Poznan University of Life Sciences (Uniwersytet Przyrodniczy w Poznaniu)
- P.P. Shirshov Institute of Oceanology
- Precourt Institute of Energy
- Predictive Science, Inc.
- Predictive Sciences Inc.
- PRES Université de Grenoble
- PRES Université de Toulouse
- PRES Université Nantes Angers Le Mans
- PRES Université Paris-Est
- Prince of Songkla University
- Princeton Institute for the Science and Technology of Materials
- Princeton Plasma Physics Laboratory
- Princeton University
- Processus de la variabilité climatique tropicale et impacts
- Processus et interactions de fine échelle océanique
- Production Engineering, Machine Design and Automation
- Propriétés mécaniques et thermodynamiques des matériaux
- ProSensing Inc.
- Proxemy Research Inc
- PSI Center for Energy and Environmental Sciences
- Public Health England [London]
- Puertos de l’Estado
- Purdue University [West Lafayette]
- Purple Mountain Observatory
- Pusan National University
- Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation