Nowadays, customer preferences and desires are changing and marketing decisions that are based on customer knowledge are critical. Achieving customer's opinions, needs, and feedback will lead to the development of an organization and create a sustainable competitive. Examining the components of knowledge management in the organization and its implementation is one of the most critical components of organizational success. Therefore, this study aims to determine the effect of knowledge management on organizational performance by considering the mediating role of marketing communications in Iran Airports Company. A quantitative methodology is adopted in which a model is developed, and hypotheses are stated, in order to examine the proposed relationship between marketing knowledge management assets and capabilities and IAC performance. A highly structured questionnaire with 35 questions is developed and distributed to a sample of 200 employees in IAC, which according to Cochran's formula, 130 employees were chosen randomly. The validity and the reliability of the questionnaire were verified using confirmatory factor analysis and cronbach's alpha coefficient respectively. In this study, to analyze the collected data and test the research hypotheses, structural equation modeling with LISREL was conducted. The results of hypothesis testing showed that knowledge management has a positive and significant effect on organizational performance. Also, the result showed that marketing has a positive effect on organizational performance. At a 95% confidence level, the result of the Sobel test showed that knowledge management has an indirect and positive effect on organizational performance through the mediating role of marketing communications.