| Mr | Obinna Charles | Ngana | Federal University Wukari | Nigeria | Materials Science and Engineering | Best Researcher Award | View Profile |
| Assoc. Prof. Dr | Odey | Alshboul | THE HASHEMITE UNIVERSITY | Jordan | Construction Management | 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 | |
| Dr | OLAOLU | FADUGBA | FEDERAL UNIVERSITY OF TECHNOLOGY AKURE | Nigeria | Geotechnical Engineering | 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 | |
| Mr | Oliver | Cernero | Austin College | United States | Environmental Chemistry | Best Researcher Award | View Profile |
| 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 |
| Dr | Oluseye | Olugboyega | Obafemi Awolowo University | Nigeria | Construction Management | Best Researcher Award | |
| Ms | Oluwabukola | Farodoye | Universidade Federal do Rio Grande do Sul | Brazil | Others | Best Researcher Award | |
| Dr | Oluwaseun | Okimiji | Lagos State University | Nigeria | Environmental Risk Assessment | Excellence in Research | |
| Mr | Oluwaseun | AKINYEMI | University of Houston | United States | Environmental Risk Assessment | Best Researcher Award | View Profile |
| Ms | Oluwaseun | Fatoye | Anchor University Lagos | Nigeria | Sustainable Development | Women Researcher Award | View Profile |
| Dr | Oluwatoyin Joseph | Gbadeyan | University of KwaZulu-Natal | South Africa | Materials Science and Engineering | Best Researcher Award | View Profile |
| Dr | Om Prakash | Singh | Jaipur National University | India | Structural Health Monitoring | Best Researcher Award | |
| Mr | Omar | Soufi | Mohammed V University of Rabat Mohammadia School of Engineering | Morocco | Materials Science and Engineering | Best Researcher Award | |
| Assoc Prof Dr | Omid | Mehrpour | Wayne state university | United States | Others | Top Researcher Award | |
| Dr | Omvir | Singh | Rajiv gandhi Institute of Petroleum Technology | India | Sustainable Development | Best Researcher Award | View Profile |
| Mr | ONKAR NATH | MISHRA | Kamla Nehru Institute of Technology,Sultanpur | India | Geotechnical Engineering | Best Researcher Award | |