The aim of this research was to determine the effect of transformational leadership on organizational performance through the mediating role of organizational culture in higher education institutions (HEIs) in Iraq. Transformative leadership was the main theory used in this study. This theory stated that the role of a transformative leader in influence his or her subordinates through motivation, intellectual stimulation, caring, and charismatic role model. Based on the research questions, four main hypotheses were developed and statistically tested, the population (N = 6,294) in this study comprised the academic staff. A sample was selected by using stratified random sampling. A sample size (n = 387) was determined by using Krejcie and Morgan's table of sample sizes. Data were collected using a questionnaire as an instrument. This research used Structural Equation Modelling (SEM) to test the hypotheses. The findings showed a strong effect between transformational leadership .....

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