This guide is the result of the “Building Strategies to Improve the Protection of Undocumented Children in Europe” project, which aimed to spread understanding of the challenges children in an irregular migration situation face in accessing their fundamental rights to education, healthcare and housing in Europe, and to share and develop good practices and strategies to overcome these barriers. The guide is designed to acknowledge, appreciate and endorse the crucial work being undertaken to realise the rights of children and families in an irregular migration situation. It is published in appreciation of the collective efforts, strength and perseverance of the advocates who work to realise the rights of this excluded group. This work is ongoing and it is crucial to continue to work together, to build strategies, and to strengthen solidarity for all vulnerable groups, including undocumented children and families. The voices and actions in support of undocumented children and families should continue to grow louder, more prominent and become more visible, to ensure all undocumented children are perceived and protected as children, first and foremost. The guide pulls together the strategies and ideas shared at the national level workshops by equipping practitioners with good practices on how to secure undocumented children’s access to basic social rights in Europe. The guide is intended to be accessible to and usable by all – including undocumented families, healthcare professionals, lawyers, public officials, policy makers and civil society organisations.