| Ms | Oluwaseun | Fatoye | Anchor University Lagos | Nigeria | Sustainable Development | Women Researcher Award | View Profile |
| Ms | Oluwabukola | Farodoye | Universidade Federal do Rio Grande do Sul | Brazil | Others | Best Researcher Award | |
| Dr | Oluseye | Olugboyega | Obafemi Awolowo University | Nigeria | Construction Management | Best Researcher Award | |
| Dr | Olivier | Joassard | INNOTHERA Laboratories | France | Others | Research Excellence in Civil and Environmental Engineering Award | View Profile |
| Prof | Olivier | MASSOL | CentraleSupelec - Univeristy Paris Saclay | France | Environmental Policy and Management | Best Researcher Award | View Profile |
| Mr | Oliver | Cernero | Austin College | United States | Environmental Chemistry | Best Researcher Award | View Profile |
| Dr | Oleksandra | Tolochyna | Frantsevich Institute for Problems of Materials Science NAS Ukraine | Ukraine | Materials Science and Engineering | Best Researcher Award | |
| Dr | OLAOLU | FADUGBA | FEDERAL UNIVERSITY OF TECHNOLOGY AKURE | Nigeria | Geotechnical Engineering | Best Researcher Award | View Profile |
| Dr | Olakunle | Olorntobi | Universiti Malaysia Terengganu | Malaysia | Climate Change Mitigation and Adaptation | Excellence in Research | |
| Dr | Olakunle | Oloruntobi | Universiti Malaysia Terengganu | Malaysia | Climate Change Mitigation and Adaptation | Excellence in Research | |
| Assoc. Prof. Dr | Odey | Alshboul | THE HASHEMITE UNIVERSITY | Jordan | Construction Management | Best Researcher Award | View Profile |
| Mr | Obinna Charles | Ngana | Federal University Wukari | Nigeria | Materials Science and Engineering | Best Researcher Award | View Profile |
| Assoc. Prof. Dr | Obaid | Rehman | Lanzhou University of Finance and Economics | China | Environmental Engineering | Best Researcher Award | View Profile |
| Dr | Nzalalemba Serge | Kubanza | University of the Witwatersrand | South Africa | Environmental Policy and Management | Best Researcher Award | View Profile |
| Dr | NYAMBANE | ONTITA | Central south university, china | Kenya | Environmental Microbiology | Excellence in Innovation Award | View Profile |
| Prof | Nurhan | Ecemis | Izmir Institute of technology | Turkey | Earthquake Engineering | Best Researcher Award | View Profile |
| Mrs | Nuray | Benli Yıldız | Duzce University | Turkey | Others | Best Scholar Award | View Profile |
| Mrs | Noudy | Sengxeu | faculty of pharmacy | Lao People's Democratic Republic | Others | Best Researcher Award | View Profile |
| Prof | NORDINE | LEKLOU | Nantes Université / Laboratoire GeM UMR CNRS6183 | France | Materials Science and Engineering | Research Excellence Award | View Profile |
| Assist. Prof. Dr | Norah | Albishri | Princess Nourah bint AbdualRahman University | Saudi Arabia | Sustainable Development | Best Researcher Award | View Profile |