In pursuing sustainable progress, the efficiency of civil society organizations in Yemen plays a pivotal role in fostering social and environmental development. This paper proposes a model that positions economic development as a mediating variable, linking the efficiency of these organizations with broader development goals. Understanding these dynamics is crucial given Yemen's unique socio-economic challenges and the global emphasis on sustainability. The study will employ a quantitative approach to investigate how civil society organizations in Yemen can effectively channel economic growth to achieve social and environmental outcomes. By focusing on the interconnections between these variables, the research aims to provide actionable insights and strategies for enhancing the impact of civil society organizations. The findings will contribute to a deeper understanding of the mechanisms through which economic development can facilitate sustainable change, offering valuable guidance for policymakers and practitioners.