This study examines the influence of various leadership styles on Corporate Social Responsibility (CSR) within Bangkok's rapidly growing construction industry. The researchers surveyed 859 individuals through site administration from 1,278 construction sites. Utilizing Structural Equation Modeling to analyze data from construction companies, the study found a correlation between transformational and ethical leadership styles and the successful implementation of CSR initiatives. The study emphasizes how vital organizational culture and employee engagement are in strengthening the connection between leadership and corporate social responsibility. The findings underscore the positive impact on employee engagement when leaders involve them in decision-making. By promoting higher engagement, companies can improve their CSR efforts. Transformational leadership significantly impacts positive results by establishing a clear vision that aligns with corporate social responsibility values. Highlighting the significance of ethical leadership, it becomes evident that adhering to moral principles in leadership can significantly contribute to a strong emphasis on CSR. To achieve a crucial outcome, it is advised that construction firms emphasize fostering transformational and ethical qualities in their leadership development programs. In addition, implementing participative strategies can significantly improve corporate social responsibility practices. This research provides a valuable framework for companies seeking to improve their CSR efforts and offers insights for policymakers interested in promoting sustainable development in the industry.