In this edited volume, contributors explore the various threats-both security- and (dis)information-related-that are present within the European digital environment, along with the subsequent regulations imposed across the region in response to these threats. Due to the fluctuating evolution of EU-wide and national regulatory approaches to the digital sphere and the differences in each approach, it is crucial to examine the current state of that regulation on both levels to better understand each approach and its consequences. Thus, contributors analyze these phenomena from both European and national perspectives to identify best and unsuccessful practices. The volume is divided into four sections - first, it maps threats and trust around disinformation in the European digital environment. The second part goes on to identify examples of successful approaches to these threats and to combatting disinformation, while the third section focuses on regulations that have been put in place by specific countries or the EU as a whole. Finally, the fourth section of the book identifies current and ongoing challenges relating to disinformation in the European digital environment, providing practical suggestions and directions for future research in this area.