This study explored the impact of school leadership and management practices on teacher collaboration at Tuntungin-Putho Integrated National High School. Using a qualitative research design, semi-structured interviews were conducted to gather insights into teachers' personal experiences and perceptions regarding leadership styles and their influence on collaborative practices. The findings revealed that school leadership plays a pivotal role in shaping the extent and quality of teacher collaboration. Specifically, autocratic decision-making practices were found to hinder active teacher involvement, while transformational and participative leadership styles fostered a sense of empowerment and shared responsibility. Based on these findings, the study recommends adopting a more inclusive and consultative approach to leadership, balancing directive and delegative strategies, and implementing professional development programs focused on collaboration, communication, and leadership skills. These initiatives aim to promote a more open, respectful, and collaborative school culture. Overall, the research underscores the vital role of effective leadership in enhancing teacher collaboration and building a supportive educational environment that contributes to school improvement and student success.