The COVID-19 pandemic had massive consequences for societies and health systems across the OECD and beyond. Health systems were not resilient enough. Resilient health systems plan and are ready for shocks, such as pandemics, economic crises or the effects of climate change. They are able to minimise the negative consequences of crises, recover as quickly as possible, and adapt to become better performing and more prepared. Smart, targeted investments in health system resilience are needed to improve health and ensure the next shock is less disruptive and costly. This report reviews the lessons of the COVID-19 pandemic and applies them to build policy recommendations to ensure the global community is ready for the next crisis. The reviews and recommendations cover health system issues – including workforce, digitalisation, continuity of care and mental health – and other topics, including long-term care, supply chains and international co-operation.