This pandemic health crisis impacts a world already in crisis. It will have a disproportionate impact on the most vulnerable in our society and particularly in the Global South unless we mobilise and demand a just response to the pandemic. It is a wake-up call that the current capitalist economic system is not fit to protect the health of us as individuals or as societies. We must learn the lessons to defeat COVID-19, address the multiple crises we face―from accelerating inequality to the climate crisis―and build the just sustainable society we all desire.