Performance is an unstable condition that can be strengthened or weakened by the ebb and flow of perspectives and the influence of one's values. Teacher performance in Madrasah Aliyah is directly or indirectly related to their perception of the leadership of the madrasah principal. Madrasah principals have a strategic role in achieving institutional goals. Organizationally the head of the madrasa is responsible for creating an organizational climate that supports the work ethic of the teachers in their environment. The creation of such an organizational climate can foster the morale and loyalty of teachers, even though they have diverse self-concepts. Likewise, teacher performance has a functional relationship with work quality and indirectly affects the productivity of learning outcomes. High and low performance is influenced by various internal and external variables. The quality of learning outcomes can be approached from the performance conditions with the variables that influence it, this is why this research was conducted. Teachers, 2) knowing and describing the effect of clinical supervision on teacher performance, 3) Knowing and describing the influence of principals' leadership and clinical supervision on teacher performance. This research method is quantitative research. The results of the study concluded that: 1) there was a positive and significant influence between Clinical Supervision (X1) on Teacher Performance (Y) with tcount = 3.058 and ttable = 1.957 where tcount > ttable. 2) There is a positive and significant influence between Madrasah Principal Leadership on Teacher Performance (Y) with tcount = 2,993 and ttable = 1,957 where tcount > ttable. 3) there is a positive and significant influence between Clinical Supervision (X1) and Principal Leadership (X2) on Teacher Performance (Y) with the regression equation = 57.771 + 0.147x1 + 0.240x2, with a coefficient of determination R2 (R square) of 0, 99 which means that the clinical supervision and leadership of the madrasah principal can affect the teacher's performance by 9.9%.