Knowledge creation and innovation are primary competitive advantage in the modern economy. Social capital, on the other hand, is one the most important components of organizations, which could help share knowledge within organization and create competitive advantage. The purpose of this paper is to investigate the impact of social capital on knowledge creation in petrochemical industry. The survey designs a questionnaire and distributes it among some experts who worked for petrochemical industry. The study investigates the impact of social capital in terms of three components of cognitive, relational and structural capitals on knowledge creation. Cronbach alpha in combined form is calculated as 0.79, which validates the overall survey. Structural equation modeling has been used to examine the proposed study and the results have confirmed that all three items positively influence knowledge creation, significantly.