The aim of this work is providing a model for determining impact of organizational culture, teamwork and organizational development on organizational commitment with emphasis on the mediating role of human capital. The 266 employees of SAFA Industrial Group were selected using random sampling and they responded research tools. Path analysis test was used for analysis of research data. Findings show that organizational culture, teamwork, and organizational development have direct and significant impact on human capital. In addition, human capital has a positive effect on organizational commitment. Organizational culture, teamwork and organizational development have direct and significant effect on organizational commitment. Finally findings show that human capital has mediating role between organizational culture, teamwork, organizational development and organizational commitment. [ABSTRACT FROM AUTHOR]