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In a knowledge- based economy, products and companies live and die on information and the most successful companies are the ones who use their intangible assets better and faster. Researches have indicated that inverse decreasing returns of traditional resources such as land, money, machinery. knowledge is really a resource to increase business performance . From a strategic perspective, intellectual capital (IC) is used to create and enhance the organizational value, and success requires IC and the ability to manage this scarce resource controlled by a company. In addition to, one of the most important organizational capabilities is social capital that can contribute to create and share knowledge in organizations and to make sustainable organizational advantage for them in comparisons with their competitors. Thus, the objective of this article is discussing on the role of social capital in developing intellectual capital in two automobile maker Companies in Iran. The method of this research was descriptive and analytical. Statistical Community of the research consists of supervisors, general managers and top managers. The results of this research indicate there is a significant positive relationship between social capital and intellectual capital in the two studied companies.