This study explores the role of national and local non-governmental organizations (NGOs) in localizing the UNREDD+ (Reducing Emissions from Deforestation and Forest Degradation) norm in Sulawesi Tengah, Indonesia. UN-REDD+ aims to mitigate climate change by promoting sustainable forest management in developing countries. Sulawesi Tengah was selected as a pilot province due to its extensive forest cover and relatively undisturbed deforestation activities. However, despite international support, the initiative encountered resistance from local communities, influenced by national and local NGOs. This research examines the complex interactions among international, national, and local NGOs by applying Acharya's norm localization theory. While international NGOs provided technical expertise, local NGOs significantly shaped the community perspective. These local NGOs raised concerns about the potential exploitation of forests and disruption to indigenous cultural values, fuelling opposition to the program. Consequently, the localization failed, and UN-REDD+ was discontinued in Sulawesi Tengah in 2012. The findings highlight the importance of considering local actors and their concerns in global environmental governance. Local NGOs, closely connected to communities, played a decisive role in rejecting the program, underscoring it, and addressing local values and governance issues.