Abstract: Accounting information system functions to process data and to generate meaningful and useful accounting information for various users. The success of accounting information system is influenced by various internal and external factors of the organization. Leadership is one of the internal factors that plays a role in the design and implementation of accounting information system. This research is intended to examine the influence of leadership behavior on the quality of accounting information system at the hospital, through 33 selected hospitals in riau province by using simple random sampling technique and simple regression analysis tool. The result of this study concludes that leadership behavior significantly influences accounting information system. The result of this study can be used to solve the problem on the implementation of accounting information system by strengthening leadership behavior.