| Obrist, Daniel | 
Desert Research Institute, | 
| Ochoa, Carlos | 
New Mexico State University | 
| Ogwo, Patrick | 
Abia State University | 
| Oh, Yong | 
Club of Rome EU Chapter | 
| Olawale, Oluwafemi | 
Federal Ministry of Science and Technology, Nigeria | 
| Oldekop, Johan | 
Sheffield Institute for International Development (UK) | 
| Olmsted, Paige | 
University of British Columbia | 
| Olsen, Christine Shaw | 
Oregon State University | 
| Olson, Anders | 
Clark University | 
| Olson, Donald | 
University of Miami | 
| Olson, Jennifer | 
Michigan State University | 
| Oluwatayo, Isaac Busayo | 
University of Ibadan | 
| Ontl, Kelly Boyer | 
Michigan Technological University | 
| Onyango, Esther | 
Griffith University (Australia) | 
| Oppong, Joseph | 
University of North Texas | 
| Opsomer, Jean | 
Colorado State University | 
| Orbach, Michael | 
Duke University | 
| Orenstein, Daniel | 
Technion Israel Institute of Technology | 
| Orians, Colin | 
Tufts University | 
| Ortiz Cotro, Jose-Maria | 
Harvard University | 
| Ostfeld, Richard | 
University of California - Berkeley | 
| Ostrom, Elinor | 
Workshop in Political Theory and Policy Analysis, Indiana University; Center for the Study of Institutional Diversity, Arizona State University | 
| Ostrom, Peggy | 
Michigan State University | 
| Ouyang, Zhiyun | 
Chinese Academy of Sciences Research Center for Eco-Environmental Sciences | 
| Ouyang, Zutao | 
Michigan State University | 
| Ozdogan, Mutlu | 
University of Wisconsin | 
| Ozertan, Gokhan | 
Bogazici University |