Care-leavers – those transitioning from alternative care towards young adulthood – are widely recognized as a vulnerable population, yet child protection legislation seldom applies to them because they have reached adulthood. Despite this, little internationally comparative research on care-leaving policy and legislation has been conducted. This paper maps multinational policy and legislation and its impact on the services to care-leavers and the challenges they experience. An online survey was conducted with key informants in 36 countries and analysed by a multinational team of care-leaving scholars. Findings reveal that few countries have well-developed care-leaving legislation. Most countries provide little aftercare beyond the age of 18, even when legislation provides for it. Within the context of suboptimal social policy and limited aftercare services, findings also reveal high vulnerability among care-leavers. Recommendations for policy development, global dialogue, further research and advocacy are proposed.