This study aims to analyze the principal's leadership strategy in developing teachers' Organizational Citizenship Behavior (OCB) at a private vocational high school in Solear District. The study used a descriptive qualitative approach with a case study strategy. Data collection was conducted through in-depth interviews, observations, and documentation studies involving the principal as key informant and teachers as key informants. The results showed that the principal implemented leadership strategies that included exemplary work attitudes and behaviors, open communication of the school's vision and goals, strengthening a collaborative work culture, creating a conducive work climate, and empowering and appreciating teachers. These strategies contributed positively to the development of teachers' OCB dimensions, such as trust, job satisfaction, altruism, sportsmanship, and civic virtue, although the level of OCB internalization was not yet fully distributed. The research findings also revealed that limited structural support, high workload, and a suboptimal reward system were inhibiting factors in strengthening OCB sustainably. This study concluded that principal leadership oriented towards values, empowerment, and humanistic interpersonal relationships have a strategic role in building teachers' OCB and a positive school organizational culture. The results of this study are expected to serve as a reference for developing educational leadership practices and strengthening organizational culture in private vocational schools.
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