This article presents "Decolonizing Southeast Asian Sound Archives" (DeCoSEAS), a three-year research and community engagement project funded by the Joint Programming Initiative (JPI) on Cultural Heritage and Global Change supported by the European Union’s Horizon 2020 Research and Innovation Programme. DeCoSEAS proposes the decolonization of heritage curation with three formative orientation points: the improvement of access to heritage, the transfer of agency to stakeholders of their heritage, and the diversification of the dialogue about this heritage’s curation. For this aim, researchers based in the Netherlands, the United Kingdom and France work together with academics, curators and NGOs in Southeast Asia in opening up three unique sound collections, all located in Europe and barely accessible to researchers and cultural originators. https://www.decoseas.org The web platform of sound archives: https://pratinada.net/