The objective of this study is to find the headmaster leadership model implemented in Banat Nahdhatul Ulama (NU) Islamic Senior High School Kudus. Ethnographic research method was employed to this study. Moreover, the data were collected through observation, interview, documentation and Focus Group Discussion (FGD). Those data were analyzed by using Miles and Huberman theories. The result of this study showed that the Headmaster applied religious transformational leadership model which emphasizes on schools\' vision and mission as well as the school goals which are based on Tawhid. Alternatively, the achievement of the school also cannot be separated from the roles of the school\'s leaders. Theoretically, this research can be used as a study on good leadership models by headmaster. Practically, the result of this study can be utilized as a model that can be applied in other Islamic Senior High Schools.