| Mrs | Temitayo | Omoyeni | Cyprus International University | Nigeria | Engineering | Bioengineering/Biomedical Engineering | Best Researcher Award | youngscientistawards.com |
| Prof | Francis | ONDITI | Riara University, Nairobi | Kenya | Social Sciences | Conflictology/ Peace and Conflict Studies | Best Researcher Award | youngscientistawards.com |
| Mr | Obinna | Onodugo | Baylor University | United States | Engineering | Electric Machines and Drives | Research Excellence Award | youngscientistawards.com |
| Mr | Gideon | Onuh | Technion-Israel Institute of Technology | Israel | Engineering | Chemical Engineering | Young Scientist Award | |
| Ms | Victorine | Onyango | Egerton university | Kenya | Agricultural and Biological Sciences | Agricultural and Biological Sciences | Young Scientist Award | youngscientistawards.com |
| Ms | Wei Ling | Ooi | Universiti Teknologi Malaysia | Malaysia | Engineering | Electronic Systems Engineering | Best Researcher Award | |
| Dr | Marc | Oosthuizen | The IIE Varsity College | South Africa | Social Sciences | International Relations and Diplomacy | Best Researcher Award | |
| Mr | SAMSON OKIKIOLA | OPARANTI | Université du Québec à Chicoutimi | Canada | Engineering | High Voltage Insulation | Young Scientist Award | |
| Assoc. Prof. Dr | Elżbieta | Opiłowska | University of Wrocław | Poland | Social Sciences | Border Studies | Best Researcher Award | youngscientistawards.com |
| Dr | Prince Atta | Opoku | Harbin Institute of Technology | China | Environmental Science | Wastewater Treatment and Energy Generation | Best Researcher Award | youngscientistawards.com |
| Prof | Pola | Oppenheimer | Chemical Engineering | United Kingdom | Chemical Engineering | Biomedical Engineering | FutureLeaders Research Achievement Award | youngscientistawards.com |
| 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 | youngscientistawards.com |
| 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 | |