Purpose: Today, as the understanding of diversity is further expanded, the meaning of social justice becomes even more complicated, if not confusing. The purpose of this paper is to explore how school principals with social justice commitment understand and perceive social justice in their leadership practices. Design/methodology/approach: A qualitative research design is used for this study. In total, 22 school principals in Ontario were interviewed. The interviews glean data on principals' work context, their perceptions of social justice, and anecdotes, stories, and examples concerning social justice in their practices. Findings: The research findings draw attention to the central importance of awareness of the social injustices in schools--in structure, policy, and practices--and open space for debate on what can be considered as leadership for social justice. They also provide a useful starting point in exploring how leadership roles and practices can be improved to reverse injustices associated with the diversity of students based on race, socioeconomic status, gender, sexual orientation, and ability. Originality/value: What principals perceive may have a significant impact on the actions and practices for social justice. Therefore, it is important to gain insight into principals' persecutions and perspectives on social justice as they may become norms and criteria that guide their actions.