| Author(s) | Organization(s) | Session |
| Cabaço, Susana | Netherlands Interdisciplinary Demographic Institute (NIDI), Netherlands | Mixing the Modes |
| Calderwood, Lisa | University College London, United Kingdom | Mixing the Modes |
| Cameletti, Michela | University of Bergamo, Italy | Social Media and Online Communities |
| Cargnino, Manuel | Universität Duisburg-Essen, Germany | Citizens on Social Media Presenter |
| Carolus, Astrid | Universität Würzburg, Germany | Fake News, Fake Users Presenter |
| Carre, Cecile | Ipsos | Text Mining and NLP |
| Catharina, Münch | Universität Würzburg, Germany | Fake News, Fake Users |
| Ceni, Arber | Social Media Research Foundation, USA/Germany/Albania | Communication on Social Media |
| Cernat, Alexandru | University of Manchester, United Kingdom | Mixing the Modes Presenter |
| Comanaru, Ruxandra | NatCen Social Research, United Kingdom | Scales and Don't Know Answers |
| Compiet, Kris | Vodafone Ziggo, The Netherlands | GOR Best Practice Award 2019 Competition I |
| Cornesse, Carina | University of Mannheim, Germany | Learning Effects, Recall, and Panel Conditioning Push-to-web and Recruitment |
| Corradini, Nina | The Visual Agency, Italy | Data Visualization – From Relevant Insights to Meaningful Stories Presenter |
| Couper, Mick P. | University of Michigan | Poster Session (Part IV) Using Smartphone Data for Social Science Research Learning Effects, Recall, and Panel Conditioning |
| Crossley, Thomas F | University of Essex, United Kingdom | Using Smartphone Data for Social Science Research |
