| Prof Dr | Metin | ORBAY | Amasya University | Turkey | Other | Quality/Quantity in Research | Best Researcher Award | |
| Dr | Kelly | Oriakhi | University of Benin | Nigeria | Biochemistry, Genetics and Molecular Biology | Biochemistry | Best Researcher Award | |
| Dr | Chinna | Orish | University Of Portharcourt Neuroscience Group | Nigeria | Neuroscience | Neurotoxicology | Women Researcher Award | |
| Dr | Cilísia | Ornelas | FEUP - Department of Civil Engineering, Porto | Portugal | Arts and Humanities | Cultural and Urban Heritage/ Building Constructions/Civil Engineering | Best Researcher Award | |
| Dr | Marcelo | Ortega | Universidad Politécnica de Madrid | Spain | Engineering | Combustibles renovables | Excellence in Research | |
| Mrs | Rosa Elia | Ortega Pelayo | Canadian Nuclear Laboratories | Canada | Engineering | Nuclear | Best Researcher Award | View Profile |
| Mr | Cristhian | Ortiz | UASLP | Mexico | Economics, Econometrics and Finance | Agricultural Economics | Young Scientist Award | |
| Dr | Opeyemi | Osanaiye | Nile University of Nigeria | Nigeria | Engineering | Data Communication/Cyber Security/Machine Learning | Best Researcher Award | |
| Ms | REJOICE NTIRIWAA | OSSEI-BREMANG | Kwame Nkrumah University of Science and Technology | Ghana | Environmental Science | Waste management (Waste-to-Energy) | Young Scientist Award | |
| Mr | Daniel | Ossulivan-Hewlett | University of Cape Town | South Africa | Engineering | Geo-informatics | Young Scientist Award | |
| Mrs | Sardar | Othman | Erbil polytechnic university | Iraq | Physics and Astronomy | Radiation physics | Young Scientist Award | |
| Assoc Prof Dr | Nor Azlan | Othman | Universiti Teknologi MARA, Cawangan Pulau Pinang | Malaysia | Engineering | Bioengineering | Best Researcher Award | |
| Mr | Erick | Otieno | Kenyatta University | Kenya | Agricultural and Biological Sciences | Soil fertility and science | Best Researcher Award | |
| Dr | Amazigh | Ouaksel | CEREGE - Aix Marseille université | France | Environmental Science | risque environnementaux//nanoparticules/milieux aquatiques | Young Scientist Award | View Profile |
| Mr | Baptiste | Oudon | Unilasalle | France | Engineering | Geo-science | Young Scientist Award | |
| Dr | Riadh | Ouerchefani | Higher Institute of Human Sciences, Tunis El Manar University, Tunisia | Tunisia | Psychology | Neuropsychology | Excellence in Research | |
| Prof. Dr | Zhenyu | Ouyang | Ningbo University | China | Engineering | Fluid Mechnics | Young Scientist Award | View Profile |
| Dr | Kesiena | Owebor | Delta State University | Nigeria | Engineering | Energy | Best Scholar Award | View Profile |
| Mr | Afolabi | Owoloye | Nigerian Institute of Medical Research | Nigeria | Biochemistry, Genetics and Molecular Biology | Drug discovery | Young Scientist Award | |
| Dr | Abel Kolawole | Oyebamiji | Adeleke University, Ede, Osun State, Nigeria | Nigeria | Chemistry | Physical Chemistry | Best Researcher Award | |