This article aims to explore how democratic community is manifest in schools in Korea. It also tries to examine how leadership, specifically transformational leadership, functions in shaping a democratic community within a school. Toward this aim, we have conducted a case study of two religious high schools in Korea. Based on the findings from the schools, we have discussed five aspects related to democratic community and transformational leadership. When school principals' leadership has transformational characteristics and consistency over the years, the leaders' mission and vision become shared values among the school members. The shared vision and cultural values make democratic systems work effectively. This article includes implications for educational policy and practice.