This study investigates the impact of board diversity—specifically board gender diversity (BGD), board experience (EX), and board independence (IND)—on corporate social responsibility (CSR) within Egyptian stock market firms during the period from 2015 to 2019. Using a quantitative research methodology, data from EGX100 companies were analyzed to examine the relationships between board characteristics and CSR performance. The analysis employed regression models to address challenges such as autocorrelation and multicollinearity, particularly concerning firm size. The findings reveal a significant positive relationship between BGD and CSR, while board independence shows a moderate yet significant impact. Board experience, however, demonstrated a weaker correlation. These results highlight the predictive value of board diversity in explaining CSR performance. This research provides valuable insights for policymakers, investors, and management by emphasizing the importance of promoting diverse and independent boards. Recommendations for future research include investigating additional board and firm-level variables and enhancing corporate governance frameworks to support sustainable market development.