| Author(s) | Organization(s) | Session |
| Oberski, Daniel | Utrecht University, Netherlands, The | Digital Trace Data and Mobile Data Collection |
| Ochoa, Carlos | Research and Expertise Centre for Survey Methodology, Universitat Pompeu Fabra | Poster III Presenter |
| Oehrl, Mareike | Q Agentur für Forschung, Germany | GOR Best Practice Award 2021 Competition II |
| Ozturk, Aykut | University of Glasgow, United Kingdom | Social Media Sampling Presenter |