This study examines the effectiveness of internal auditing and the significant role it plays in reducing fraud in the economic unit. Given the global trend towards the importance of internal auditing and its effectiveness in order to enhance transparency and for internal auditing to play its significant role in reducing fraud and in order to give strength and reliability to the work it performs. This research seeks to understand the role of internal auditing effectiveness and its ability to reduce fraud in the economic unit within a unit characterized by its economic and organizational challenges. A questionnaire was distributed to 110 Iraqi academics and professionals specialized in economics, accounting and finance in order to collect their opinions on the impact of internal auditing effectiveness. Through accurate statistical analysis, the study concluded that there is a significant role and impact of internal audit effectiveness and its adequate adoption in reducing fraud in the economic unit. These results contribute to the ongoing debate on the effectiveness of internal auditing in auditing work and provide valuable insights for policy makers, regulators and practitioners who aim to improve the quality of auditing work. The study emphasizes the importance of considering local economic conditions and the level of internal audit support and its effectiveness when evaluating the role of internal audit effectiveness in reducing fraud in economic units. This research provides prospects for further investigation and inquiry into the factors that mediate the relationship between the adoption of the application of international internal audit effectiveness to organize audit work and its role and contribution to reducing fraud in economic units, with the aim of enriching information about the effectiveness of internal audit in achieving quality audit work and reducing fraud cases.