Social capital is one of the most important supports that any political and institutional system can use to take advantage of opportunities as well as to face cultural threats in the national and international arena. On the other hand, at present, cultural threats and aggression have become one of the important tools and strategies of the great powers of the international system in the face of challenging and emerging powers. The main question that this article seeks to answer is the impact of social capital on soft threats against the Islamic Republic of Iran. Therefore, the purpose of this article is to explain the effect of these two variables on each other. In this regard, using a descriptive-analytical method, it is hypothesized that cultural threats are a variable that is affected by social capital, which means that as social capital increases in a society, cultural threats decrease inversely, and vice versa, To the extent that social capital is weakened, on the contrary, cultural threats increase and national culture is endangered and threatened.