Tropical Rainforests in Peninsular Malaysia have a very important role in social, economic, and ecological development locally and transnationally. During the British colonial period, the forests in Peninsular Malaysia were heavily exploited until the idea of conservation came into existence to avoid the depletion of forest resources in the future. The colonial government subsequently established the Forestry Department by designating certain areas as forest reserves. However, after Independence, these forest areas continued to remain under threat to the extent that it has resulted in a decline in forest cover in addition to damage, fragmentation, and degradation of forests in favour of government policies that prioritized economic development. The rush for economic growth has created a conflict between forest stakeholders, particularly the state government and environmental non-governmental organizations (ENGOs). The objective of this paper is to present the role of ENGOs related to issues in deforestation and forest protection efforts within Endau-Rompin between 1970 where the EndauRompin controversy began until the establishment of Endau-Rompin State Park (Pahang) in 2000. This study used a qualitative approach, that is primary sources such as Parliamentary Hansard and newspapers, and secondary sources such as books and journal articles. In addition, field research was carried out through the observation of forest-related activities organized by several ENGOs. The findings of the study showed that one of the most critical roles of ENGOs in dealing with the issue of deforestation is to prevent activities that damage the forest, especially legal activities that involve decisions made by the state government. The involvement and role of ENGOs can only delay or prolong the process of losing forest cover. This happens because the state government has authority over the land (forest) matters according to the Federal Constitution which cannot be disputed from a legal point of view. The efforts to save the forest can only depend on the political will on whether the state government wants to address or ignore the concerns voiced by ENGOs in issues related to deforestation.