“Mapping of the Central and Eastern European non-governmental heritage sector: Report” presents the findings of the first comprehensive mapping of the non-governmental heritage sector in Central and Eastern Europe, conducted in 2023–2025, which covers ten countries: Belarus, Czechia, Estonia, Hungary, Latvia, Lithuania, Poland, Romania, Slovakia, and Ukraine. This research project is a response to a pressing knowledge gap. Despite the growing visibility of heritage NGOs and their essential contribution to safeguarding, interpreting, and reimagining Europe’s diverse cultural and natural heritage, no systematic comparative study has, until now, attempted to map this vibrant sector across the CEE region. The study estimates that approximately 33,500 NGOs across the region are engaged in heritage-related activities.