| Dr | Omar | Sims | Cleveland Clinic | United States | Medicine and Health Sciences | Hepatology | Best Researcher Award | environmentalscientists.org |
| Dr | Oluwatoyin Joseph | Gbadeyan | Durban University of Technology, South Africa | South Africa | Environmental and Sustainable Materials | Waste valorization and Bioeconomic | Best Researcher Award | environmentalscientists.org |
| Dr | Oluwatayo | Ojo | Cranfield University | United Kingdom | Engineering | Energy Economics and Policy | Best Researcher Award | environmentalscientists.org |
| Dr | Oluwaseun | Adeniji | University of Johannesburg | South Africa | Biotechnology | Nanotechnology | Best Researcher Award | environmentalscientists.org |
| Dr | Oluwakamisi | Akinmoladun | University of Johannesburg | South Africa | Agricultural and Biological Sciences | Animal Science, Food Safety, Food Security | Best Researcher Award | environmentalscientists.org |
| Mr | OLUFISAYO | OJO | DURBAN UNIVERSITY OF TECHNOLOGY | Nigeria | Environmental and Sustainable Materials | Sustainability and Waste Management | Best Researcher Award | environmentalscientists.org |
| Dr | OLIVE | YEMELE MEKONTCHOU | Hohai University | China | Engineering | Water pollution research | Women Researcher Award | environmentalscientists.org |
| Dr | Olesia | Hriekova | University of Rome Tor Vergata | Italy | Environmental Science | Transportation | Best Researcher Award | environmentalscientists.org |
| Dr | Oleg | Uzhga-Rebrovs | Rezekne Academy of Technologies, Faculty of Engineering, Institute of Engineering | Latvia | Decision Sciences | Risk evaluation and analysis | Excellence in Research | environmentalscientists.org |
| Mr | Ojonugwa | Ejiga Peter | Morgan State University | United States | Environmental Science | Artifiicial Intelligence | Best Researcher Award | environmentalscientists.org |
| Mrs | Ojone | Anyebe | Ahmadu Bello University, Zaria, Nigeria | Nigeria | Ecology and Conservation | Sustainable Agricultural Practices | Best Researcher Award | environmentalscientists.org |
| Mrs | NUR | ERADLI | Istanbul Technical University | Turkey | Social Sciences | Business Administration | Best Researcher Award | environmentalscientists.org |
| Dr | Nuno | Gama | Universidade de Aveiro | Portugal | Chemical Engineering | Reciclagem de plasticos | Outstanding Scientist Award | environmentalscientists.org |
| Dr | Ntelekwane | Khasapane | Central University of Technology | South Africa | Others | Microbiology | Best Researcher Award | environmentalscientists.org |
| Assoc. Prof. Dr | Novrys | Suhardianto | Department of Accountancy, Faculty of Economics and Business, Universitas Airlangga | Indonesia | Business, Management and Accounting | Sustainability Accounting | Research Excellence Award | environmentalscientists.org |
| Dr | Nourhen | OMRI | IPREM, UPPA, France | France | Environmental and Sustainable Materials | Rare Earth Elements recovery from mining waste | Best Researcher Award | environmentalscientists.org |
| Mr | Nouman | Liaqat | Al-Dafe Trading and Contracting Company | Saudi Arabia | Engineering | Electrical Engineer | Best Research Article Award | environmentalscientists.org |
| Mr | Nordine | Quadar | Royal Military College of Canada | Canada | Renewable Energy Technologies | Digital Twin applications for Smart Grid | Best Researcher Award | environmentalscientists.org |
| Dr | Noora | Al-Qahtani | Qatar University | Qatar | Environmental Science | environmental and sustainable technologies | Best Researcher Award | environmentalscientists.org |
| Dr | Nontobeko | Mvubu | University of KwaZulu-Natal | South Africa | Biochemistry, Genetics and Molecular Biology | Medical Microbiology | Best Researcher Award | environmentalscientists.org |