AbstractIn the wake of post-apartheid educational reforms, South African secondary schools continue to grapple with persistent challenges such as underperformance, resource limitations, and socio-economic disparities, particularly in historically disadvantaged communities. Despite these systemic issues, some schools exhibit resilience and sustained success, prompting inquiry into the cultural values and practices that underpin their effectiveness. This study aimed to explore the school culture and core values that contribute to the sustainability and long-term success of secondary schools. Guided by an interpretivist paradigm, a qualitative approach was employed using a generic qualitative design. Data were collected through purposive sampling and semi-structured interviews with key school stakeholders. Thematic analysis revealed several interrelated values and practices integral to school success, including discipline, strong school ethos, community involvement, collaborative planning, teamwork, positive role modelling, monitoring and evaluation, and effective communication. These elements collectively foster a resilient school culture that promotes academic performance, teacher morale, learner wellbeing, and institutional longevity. Based on these findings, the study recommends fostering a values-driven and collaborative school culture, strengthening community engagement, promoting inclusive planning and monitoring practices, and encouraging effective communication and role modelling. The study concludes that sustainable secondary schools are built on intentional cultural practices that enable adaptability, cohesion, and long-term growth, ultimately producing not only academically successful learners but socially responsible citizens. Keywords: school culture, sustainability, values-driven leadership, community engagement, educational success.