Due to their important roles in organizational performance, internal marketing and organizational citizenship behavior have become more interesting subjects among researchers and practitioners. However, empirical research is limited in the literature, and the relationship between these two variables in higher educational institutions is not clear. Hence, the purpose of this study was to examine the effect of internal marketing on organizational citizenship behavior of academic staff in higher educational institutions. The data for the study was collected from academic staff who worked in the faculty of sport sciences in Turkey. The findings showed a statistically significant positive effect of internal marketing on organizational citizenship behavior. As a result, this study revealed that internal marketing is an effective tool for organizational citizenship behavior of academic staff.