Abstract. This article examines the relationship between social capital and sustainable development in Afghanistan. Social capital is a tangible asset through which individuals and groups can leverage social relationships, including values, social networks, and trust, to gain economic and social benefits. Social capital, alongside other types of capital such as financial and cultural capital, plays a significant role in society's transformation and balanced development. Development requires balanced progress across various dimensions, and sustainable development eradicates inequality and poverty by strengthening justice and equality. Therefore, the development process in society is as dependent on cultural and social capital as it is on economic capital. This research employs a qualitative approach and document review, aiming to analyze the relationship between social capital and sustainable development in Afghanistan. The findings indicate that higher levels of social capital are deeply connected to development. This research clarifies the contradictory perceptions in the literature regarding the impacts of social capital on sustainable development, demonstrating that social capital has a profound connection to sustainable development.