investigating the mediating role of organizational culture in the relationship between transformational leadership and organizational effectiveness

Purpose: the aim of this study was to investigate the effect of transformational leadership dimensions on organizational effectiveness with respect to the mediating role of organizational culture. methodology: the statistical population of this research is iranian knowledge-based companies, which at the time of collecting research data, their number is 4551 companies. data collection method was based on three questionnaires: mlq leadership styles, hofstede organizational culture and parsons organizational effectiveness. the analysis of research data was done through structural equation modeling and using smart pls software in two parts: measurement model and structural model. the sampling method used in this study is stratified random sampling method and the sample studied in this study using cochran’s formula, 354 companies were obtained, of which 354 questionnaires were distributed online among these companies and 175 the completed questionnaire was collected for analysis. findings: the findings of the present study show that the effect of ideal influence and motivational motivation variables on organizational culture and also the effect of organizational culture on organizational effectiveness is positive and significant and also organizational culture mediates the relationship between transformational leadership and organizational effectiveness. originality/value: given that traditional methods of management and leadership, in today’s changing and dynamic conditions, lack the necessary effectiveness, so a change in the leadership style of managers and the use of transformational leadership is necessary to achieve organizational effectiveness.