This study aims to find the impact of leadership style (Transformational leadership and Transactional leadership) on the performance of Nurses in the Health sector. The study conducted in Temar medical Center, Erbil, Kurdistan Region. Fifty questionnaires have been distributed. The data collected analyzed by Statistical Package for the Social Sciences (SPSS). After ensuring the reliability and validity, the results indicated both leadership style, Transformational leadership, and Transactional leadership had a positive and significant impact on nurses' performance. However, the results showed Transformational leadership style more important compared to Transactional leadership on Nurse's performance