| Okunuga, Oluwaseun | Institute of Human Virology Nigeria, Nigeria | Elevator Pitches 1 |
| Olanrewaju, Scholastica | Institute of Human Virology Nigeria, Nigeria | Elevator Pitches 1 |
| Oldford, Wayne | University of Waterloo | Elevator Pitches 2 |
| Omuh, Helen | Institute of Human Virology Nigeria, Nigeria | Elevator Pitches 1 |
| Ooms, Jeroen | UC Berkeley, Netherlands, | Keynote: The R-universe project Presenter |
| Orellano, Emanuel | Instituto de Investigación de la Cadena Láctea (IDICAL-CONICET-INTA), | Elevator Pitches 2 |
| Orlandi, Vittorio Dominic | Duke University, United States of America | 9C - Statistical modeling and data analysis 2 Presenter |
| Oteros, Jose | Department of Botany, Ecology and Plant Physiology. University of Cordoba. Cordoba (Spain) | Elevator Pitches 2 |
| Ott, Miles | Smith College | 5A - Teaching R and R in Teaching |
| Oviedo-de la Fuente, Manuel | University of Coruña, Spain | Elevator Pitches 2 Presenter |