Corporate governance aims efficiency and productivity in business activities, reliability in reporting, protection of stakeholders’ rights and interests. Quality corporate governance practices provide businesses a more effective and transparent management approach, and the opportunity to benefit from international financial resources more easily and at cheaper costs.With the assurance and consulting activities, internal audit plays an active role in ensuring quality in corporate governance processes. In order to get expected contribution from itself for corporate governance of internal audit, it is important internal audit activities to be carried out within the scope of internal audit standards. In this respect, it is important to reveal the role of internal audit activities carried out within the scope of standards on corporate governance quality. This study was carried out on the companies in the BIST corporate governance index in order to evaluate the role of the internal audit activities carried out within the scope of international internal audit standards on corporate governance quality through multiple regression analysis. In the scope of multiple regression analysis, backward elimination method was applied. According to the results of the analysis conducted within the research, hypotheses of the research were accepted. It was revealed that the internal audit activities carried out within the scope of international internal audit standards had an impact on the quality of corporate governance.