Internal audit comprises the plan of the organization and coordinates all the methods adopted within the business to safeguard its assets, check the accuracy and reliability of its accounting data, promote operational efficiency, and encourage adherence to prescribed managerial policies. It determines the reliability, reality, and integrity of the financial and the operational information that comes from different organizational units on which appropriate business decisions at all levels of management are based. Internal audit is an independent, material and consultancy activity, which adds value and improves the functioning of an organisation. Successful implementation of internal audit tasks means that it must be independent meaning thereby company’s management should in no way influenced by its work, information, conclusions, and evaluations. The present paper examines the impact of internal audit on the organizational performance of Jordan Electric Power, Jordan Telecom, and National Petroleum. A sample of 290 employees has been selected for the study. Data have been collected through questionnaires and analyzed with the help of multiple linear regression. Internal audit is used as the independent variable whereas organizational performance is the dependent variable. The analysis of data revealed that there is a significant impact of internal audit on the organizational performance in companies under study.