This study aimed at determining the condition of Pesantren pricipal (mudir) leadership in improving teachers’ discipline at óne boarding school in the city of Jambi, Indonesia. Specific targets to be achieved from this research were led by two research quetions: 1). How is the mudir leadership in improving the discipline of teachers? 2). What are the obstacles of mudir leadership in improving teachers’ discipline? The research method used was qualitative method with a case study approach where the researcher described the research findings in narrative. Data collection techniques used in this research were obervation, documentation, and interview. In relation to the trustworthness of the reseach, I applied triangulation through observation, documentation, and interviews. In addtition, member checking an daudit trail were used.  In analyzing the data, I trancribed the data, coded the data, and put them into some themes. I translated the thematic data into English and presented the data in a descriptive ways. The results of the study informed that the mudir stated that they have applied some acts to improve teachers’ discipline: being an exemplary person with discipline, evaluating teachers’discipline, giving reward and punishment, and doing class visits. Some obstacles revealed in this research were physical performance of the mudir and teachers’age.