This article seeks to provide an insight into the role of school principals dealing with newly multicultural and multi-faith student populations by drawing on a mixed-methods study on state-funded multi-denominational community national schools in Ireland. The study explores the extent to which school principals address the increasing social and cultural diversity in their schools by helping to establish inclusive and supportive school environments. The study identifies the main agents in shaping the school culture, and how the multi-denominational ethos is experienced by students. The article endeavours to provide academics and practitioners with a better understanding of the importance of leadership in shaping school climate that promotes a sense of belonging for all the students.