Privacy discussions tend to revolve around the implications of passive collection of individuals’ data. What is often overlooked, however, is the different phenomenon of the active sharing of data within the framework of Citizen Science projects. Starting from this premise, this webinar will explore – from the perspectives of academic researchers, practitioners, and project leaders – what are the challenges of meeting data collection needs while protecting participant privacy. What policies and best practices are needed? From theory and practice, we will reflect on how to ensure that Citizen Science stays ‘privacy fit’ while expanding its outreach, impact and potential.