Abstract The COVID-19 pandemic, acceleration of climate change, and geopolitical turmoil have triggered discussions about how public health systems in Europe need to transform to be adequately equipped for the so-called “permacrisis”. The challenges to policy makers, health institutions and health services have become so multifaceted, that single solutions from the health sector alone no longer work. Yet, despite the complexity, countries seek to get its own house in order whilst building on inter-sectoral and European approaches in parallel. Germany, Ireland, and Ukraine have all embarked upon ambitious public health services and institutional reforms, leading to transformative change in public health systems. WHO has been accompanying these reforms. The workshop will provide a platform to draw insights and lessons on transforming public health systems from all three countries, although their population size, their socioeconomic and political situation and their public health system design is so different. As the smallest of the three countries in population, Ireland created coherence and is aligning public health actors within “Healthy Ireland” and the Sláintecaire and the Crowe Horwath public health reforms. Germany’s “Pact for the Public Health Services” has been one of the greatest public health investment programs in Europe that was initiated following lessons from the COVID-19 pandemic. And Ukraine has undertaken important legal steps to adopt a Public Health System Law, in the middle of a war of aggression on its territory. The workshop will exhibit the process of large-scale public health system transformation in each of the three countries. The purpose is to identify the enablers that make large scale system transformation possible and addressing some of the pains and gains. The workshop will have three parts. Part one consists of three presentations on large scale system reforms from each of the participating countries. Part two consists of a moderated Q&A session. Part three will focus on the synthesis of enablers for large scale public health system reforms through interaction with the workshop participants, using a digital white board. Key messages • Disruptive times can create enabling conditions for large scale public health system transformation. • Designing and implementing large scale public health system reforms is complex, requiring passion, resilience, and collaborative leadership.