- N. N. Semenov Institute of Chemical Physics
- NIOC
- Nargan Consulting Engineers
- National & Local Joint Engineering Research Center of Carbon Capture and Storage Technology, Department of Geology, Northwest University
- National Agency of Natrual Resources
- National Agency of Natural Resources
- National Center for Scientific Research "Demokritos"
- National Centre for Radiation Research and Technology
- National Energy Technology Laboratory
- National Engineering Laboratory
- National Geophysical Research Institute
- National Geophysical Research Institute (Council of Scientific and Industrial Research)
- National Institute of Environmental Research [South Korea]
- National Institute of Technology Warangal
- National Iranian Gas Company
- National Iranian Oil Company (NIOC), Corporate Planning Management
- National Iranian South Oil Company (NISOC)
- National Iranian South Oil Company Ahwaz
- National Medicines Institute - Narodowy Instytut Leków [Warsaw]
- National Museum of Natural History
- National Research Council of Canada
- National Research Council of Italy | Consiglio Nazionale delle Ricerche
- National Technical University of Athens [Athens]
- National University of Oil and Gas " Gubkin University"
- National University of Río Cuarto = Universidad Nacional de Río Cuarto
- National and Kapodistrian University of Athens
- Nationale Genossenschaft für die Lagerung radioaktiver Abfälle
- Natural Resources Canada
- Networked Controlled Systems
- New Mexico Consortium
- New Mexico Institute of Mining and Technology [New Mexico Tech]
- Newton's
- Nissan Motor Co
- Nobil
- Nobil Bio Ricerche srl
- Normandie Université
- North Carolina State University [Raleigh]
- Northwest Institute of Eco-Environnement and Resources, Chinese Academy of Sciences
- Northwestern Polytechnical University [Xi'an]
- Northwestern University [Evanston]
- Norwegian Institute for Water Research
- Norwegian University of Science and Technology
- Norwegian University of Science and Technology [Trondheim]
- Nottingham Trent University
- Noushirvani University of Technology
- Novosibirsk State University,