摘要:Transformational leadership is described as a leadership style that can motivate employees, so it can thrive and achieve at high levels of performance. Transactional leadership is described as a leadership that gives an explanation of what the responsibility of the subordinate and the reward they can expect if the specified standard is achieved. To improve the performance of teachers in SMP Katolik Wijana, Jombang needed a Principal who is able to apply transactional and transformational leadership style. This study aims to determine the effect of these two leadership styles on teacher performance. The method used in this research is survey method is by taking a sample of the population and using a questionnaire as a means of collecting data. After conducting research, the investigator obtain transactional and transformational leadership styles together to have a significant influence on the performance of teachers in SMP Katolik Wijana Jombang, transactional and transformational leadership styles partially have significant influence on the performance of teachers in SMP Katolik Wijana Jombang. Based on the reseach suggested that head of school and teacher are used transformational leadership that support the realization of optimal organizational performance.