This study examines the characteristics, challenges, and strategies of school leadership in Cambodian high schools, with a focus on leadership in resource-constrained settings. Using a qualitative case study approach, the research investigates how principals in six northwestern provinces implement leadership practices to improve educational outcomes. Data were collected through semi structured interviews with 21 principals and analyzed via thematic analysis. Key findings reveal that visionary approaches, collaborative cultures, data-driven decision-making, and resilience characterize effective leadership. Challenges such as limited resources, variable teacher quality, and insufficient professional development hinder progress. The study contributes to educational leadership theory by highlighting the critical role of tailored leadership development programs and resource management in transforming underperforming schools. Practical implications include recommendations for policymakers to expand leadership training, enhance community engagement, and prioritize funding for underperforming schools. This research offers valuable insights for improving leadership in post conflict and resource-limited educational contexts.