| Mr | Ali | Omidkar | University of Calgary | Canada | Environmental Engineering | Best Researcher Award | View Profile |
| Mr | Rustem | Omarov | National Research Moscow State University of Civil Engineering | Russia | Materials Science and Engineering | | |
| Dr | Ahmed | Omar | Cairo University | Canada | Structural Engineering | Top Researcher Award | |
| Assist. Prof. Dr | Adewale | Olutumise | Adekunle Ajasin University | Nigeria | Climate Change Mitigation and Adaptation | Best Researcher Award | View Profile |
| Dr | Oluseye | Olugboyega | Obafemi Awolowo University | Nigeria | Construction Management | Best Researcher Award | |
| Dr | Olakunle | Oloruntobi | Universiti Malaysia Terengganu | Malaysia | Climate Change Mitigation and Adaptation | Excellence in Research | |
| Dr | Olakunle | Olorntobi | Universiti Malaysia Terengganu | Malaysia | Climate Change Mitigation and Adaptation | Excellence in Research | |
| Prof | PLE | olivier | Université Savoie Mont Blanc | France | Materials Science and Engineering | Excellence in Innovation | |
| Dr | Luiz | Oliveira | CEPETRO/Unicamp | Brazil | Sustainable Development | Best Researcher Award | |
| Assist Prof Dr | Dilek | OKUYUCU | Erzurum Technical University | Turkey | Structural Engineering | Women Researcher Award | View Profile |
| Mr | Paul Michael Nii Anang | Okoe | Fugro GB North Marine Limited | United Kingdom | Others | Best Researcher Award | View Profile |
| Dr | Oluwaseun | Okimiji | Lagos State University | Nigeria | Environmental Risk Assessment | Excellence in Research | |
| Prof | heekyong | oh | University of Seoul | South Korea | Environmental Engineering | Excellence in Innovation | |
| Dr | Chaewoon | Oh | National Institute of Green Technology | South Korea | Climate Change Mitigation and Adaptation | Best Researcher Award | |
| Dr | Sehyeong | Oh | Samsung Advanced Institute of Technology | South Korea | Air Pollution Control | Best Researcher Award | |
| Prof | Enoch Nifise | OGUNMUYIWA | Botswana International University of Science and Technology | Botswana | Materials Science and Engineering | Best Researcher Award | View Profile |
| Mr | Qazeem | Ogunlowo | Kyungpook National University | South Korea | Others | Best Researcher Award | |
| Dr | Kunle Elizah | Ogundipe | University of Johannesburg | South Africa | Construction Management | Best Researcher Award | View Profile |
| Prof | Eric | Ofosu | University of Energy and Natural Resources | Ghana | Water Resources Engineering | Best Researcher Award | |
| Dr | Ifeyinwa | Obianyo | Nile University of Nigeria Abuja Nigeria | Nigeria | Geotechnical Engineering | Women Researcher Award | View Profile |