Globally, insect pest infestations of forest trees are increasing at an alarming rate, primarily due to climate change. Large-scale insect pest outbreaks have affected forest areas, imposing urgent attention to controlling forest insects through innovative, practical and sustainable approaches for preserving forest ecosystems and minimizing biodiversity loss. RNA interference (RNAi) technology is a reliable method that employs an exogenous double-stranded RNA (dsRNA) targeting one or more physiologically essential genes in a target pest in a species-specific manner. After reaching insect cells, dsRNA triggers the RNAi cascade, leading to the mortality of the pests. The current chapter summarizes the strengths and the limitations of RNAi technology, its effect on forest pests (primarily coleopterans), delivery methods, and the hurdles faced when deploying such RNAi-based strategies in forest pest management. To prevent the environmental degradation of the dsRNA and to enhance RNAi proficiency, nanoparticle-encapsulated dsRNA could be implemented to control forest pest populations. Furthermore, we also highlight the microorganism-mediated dsRNA expression and delivery systems, viral gene silencing methods, and other non-transformative approaches that minimize dsRNA production expenses and ensure safe deployment. However, RNAi-based products demand further investigation regarding the short-term and long-term environmental impacts on a case-to-case basis before commercialization.