The security of tourists is one of the main requirements in countries familiar with tourism and pleasures. Many countries with large number of tourists have developed tourist police service to ensure the safety of tourists. Thus, the performance of law enforcement organizations such as tourist police department is essential to provide a safe destination for tourists and international guests. Accordingly, it is important that the leaders of tourist police departments to be effective and capable to deal with security challenge. There has been a great interest in terms of transformational leadership and its effects in organizations. Transformational leadership is crucial since it often assists organisational employees to perform effectively and productively. Based on this argument, there is a need for a robust research to examine the impact of transformational leadership on police performance. This study is a theoretical attempt to examine the relationship between transformational leadership and organizational performance in tourism police department through knowledge management. The research is a conceptual research. Explanatory research design is used in the study. And all data used in this research are obtained from secondary sources. That is, they are data from the findings of previous researches about transformational leadership and police performance for helping police officers to fight crimes and control threats on tourism industry.