- Machine Learning and Information Access
- Macquarie University
- Macquarie University [Sydney]
- Magdeburg-Stendal University
- Maison de la Modélisation, de la Simulation et des Interactions [Sophia-Antipolis]
- Maison de l'Archéologie et de l'Ethnologie René-Ginouvès
- Maison de la Télédétection
- Maison des Sciences de l'Homme de Dijon
- Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
- Maison des Sciences Humaines de Champagne-Ardenne
- Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle
- Malaria Research and Training Center
- Malaria Research and Training Center|DEAP
- Malaysia Institute of Oceanography
- Malmö Högskola = Malmö University
- Mammal Research Institute
- Manaaki Whenua – Landcare Research [Lincoln]
- Marine and Antarctic Research Center for Innovation and Sustainability
- Marine and Atmospheric Chemistry Division [Miami]
- Marine and Atmospheric Research
- Marine and Environmental Sciences Centre
- Marine and Environmental Sciences Centre [Portugal]
- Marine and Freshwater Research Institute
- MARine Biodiversity Exploitation and Conservation
- MARine Biodiversity Exploitation and Conservation - MARBEC
- MARine Biodiversity Exploitation and Conservation - Station Ifremer Sète
- Marine Biological Association
- Marine Biology and Ecology Research Centre, School of Marine Science and Engineering
- Marine Biology Lab
- Marine Biology Laboratory
- Marine Chemistry
- Marine Chemistry Laboratory
- Marine Conservation Unit
- Marine Ecology Consultant
- Marine Ecosystems Modeling and Monitoring by Satellites
- Marine Environment Laboratories [Monaco]
- Marine Geology Department
- Marine Information Research Center
- Marine Institute [Oranmore]
- Marine Isotope Geochemistry Group
- Marine Mammal Institute
- Marine Mammal Research Unit
- Marine Physical Laboratory
- Marine Research and Antarctic Climate and Ecosystems CRC
- Marine Research Department
- Marine Research Division
- Marine Research Institute
- Marine Research Institute and Department of Biological Sciences
- Marine Research Institute Reykjavik
- Marine Science Institute
- Marine Science Institute [Port Aransas]
- Marine Science Institute [Santa Barbara]
- Marine Sciences Research Center
- Marine Scotland Science
- Marine Systems Institute
- Marine Works Japan Ltd.
- Mark Wainwright Analytical Centre [Sydney]
- Martin Ryan Institute
- Massachusetts General Hospital [Boston]
- Massachusetts Institute of Technology
- Materials and structures Laboratory
- Matériaux, ingénierie et science [Villeurbanne]
- Mathematics and computing applied to oceanic and atmospheric flows
- Mathématiques Appliquées Paris 5
- Matopos Research Station
- Max Delbrück Centre for Molecular Medicine
- Max-Planck-Gesellschaft
- Max-Planck-Institut
- Max Planck Institute for Biogeochemistry
- Max Planck Institute for Biological Cybernetics
- Max Planck Institute for Chemical Ecology
- Max Planck Institute for Chemistry
- Max Planck Institute for Chemistry, Multiphase Chemistry Department
- Max Planck Institute for Dynamics and Self-Organization
- Max Planck Institute for Evolutionary Biology
- Max Planck Institute for Marine Microbiology
- Max Planck Institute for Meteorology
- Max Planck Institute for Plant Breeding Research
- Max Planck Institute for the Science of Human History
- Max-Planck-Institut für Astronomie
- Max-Planck-Institut für Biogeochemie
- Max-Planck-Institut für Chemie
- Max-Planck-Institut für Dynamik und Selbstorganisation
- Max-Planck-Institut für Meteorologie
- Max-Planck Institut fürMeteorologie, Hamburg
- Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
- Maxwell Institute for Mathematical Sciences
- McGill University = Université McGill [Montréal, Canada]
- Mécanismes Adaptatifs et Evolution
- Medias-France
- MÉDIATIONS - Sciences des lieux, sciences des liens
- Mediterranean Center for Marine and Environmental Research
- Mediterranean Institute for Advanced Studies
- Mediterranean Science Commission
- Meise Botanic Garden [Belgium]
- Melbourne School of Engineering [Melbourne]
- Melting the frontiers between Light, Shape and Matter
- Memorial University of Newfoundland = Université Memorial de Terre-Neuve [St. John's, Canada]
- Mercator Océan
- Mercator Océan International
- Mésocentre Clermont Auvergne
- Met Eireann
- Météo-France
- Météo-France Direction Interrégionale de la Nouvelle Calédonie
- Météo-France Direction Interrégionale Sud-Est
- Meteogiornale
- MeteoModem
- Meteorología y Estudios Ambientales ? IDEAM
- Meteorological Department (St. Maarten)
- Meteorological Institute [Hamburg]
- Meteorological Office
- Meteorological Research Institute
- Meteorological Research Institute [Tsukuba]
- Meteorological Service
- Meteorological Service of Canada
- Meteorologisches Institut [Bonn]
- Meteorologisches Observatorium Hohenpeißenberg
- Meteorology and Air Quality Department [Wageningen]
- Meteorology and Air Quality Group
- MetOffice
- Met Office Climate Research Division
- Met Office Hadley Centre
- Michigan State University System
- MICrobiologie de l'ALImentation au Service de la Santé
- Microbiologie des sols-GéoSol
- Microbiology Laboratory
- Microbiology, School of Biological and Chemical Sciences, University of Galway, Ireland
- Middle East Technical University [Ankara]
- Middlemore Hospital
- Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols
- Millennium Institute of Oceanography
- Millennium Nucleus Center for Ecology and Sustainable Management of Oceanic Island
- Milner Centre for Evolution
- Minderoo Foundation
- Mines Nantes
- Mines Paris - PSL (École nationale supérieure des mines de Paris)
- Ministère de la Culture
- Ministère de la Culture et de la Communication
- Ministère de la défense (1936-....)
- Ministère de l'économie et des finances
- Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche
- Ministère de l'Europe et des Affaires étrangères
- Ministério da Agricultura
- Ministério da Agricultura, Pecuária e Abastecimento [Brasil]
- Ministério da Ciência, Tecnologia e Inovação
- Ministerio de la Agricultura
- Ministerio del Medio Ambiente, Colombie
- Ministerio de Minas y Energia
- Ministery of Science and Technology
- Ministry of Agriculture and Forestry of Laos
- Ministry of Agriculture [Guyana]
- Ministry of Defence (UK)
- Ministry of Earth Sciences [India]
- Ministry of Land and Resources
- Ministry of Marine Resources
- Ministry of Natural Resources of China
- Missouri Botanical Garden
- MIT Parsons Laboratory
- MOdel for Data Analysis and Learning
- Modeling and control of renewable resources
- Modélisation des Surfaces et Interfaces Continentales
- Modélisation du climat
- Modélisation et Méthodes Statistiques Avancées
- Modélisation Hydrologique
- Modélisation INVerse pour les mesures atmosphériques et SATellitaires
- Modélisation mathématique des maladies infectieuses
- Modélisation mathématique et informatique de systèmes complexes naturels, biologiques ou sociaux
- Modelling, Observations, Identification for Environmental Sciences
- Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics
- Molécules de Communication et Adaptation des Micro-organismes
- Mona GeoInformatics Institute
- Monash university
- Monash University [Clayton]
- Monash University [Victoria, Australia]
- Montana State University
- Monterey Bay Aquarium Research Institute
- Morphodynamique Continentale et Côtière
- Morton K. Blaustein Department of Earth and Planetary Sciences [Baltimore]
- Moss Landing Marine Laboratories
- Moss Landing Marine Laboratories [CA, USA]
- Mount Allison University (.)
- MRI
- Mullard Space Science Laboratory
- Musée canadien de la nature
- Musée royal de l'Afrique centrale
- Museo de Ciencias Naturales
- Museo de Historia Natural de Lima
- Muséum départemental du Var
- Muséum national d'Histoire naturelle
- Muséum National d'Histoire Naturelle [Concarneau]
- Museum Victoria [Melbourne]
- Museum Zoologicum Bogoriense