This study explores the intricate relationship between board gender diversity, organizational agility, and sustainability outcomes within corporate settings. Utilizing Generalized Estimating Equations (GEE), we delve into how agility moderates the impact of gender diversity on sustainability practices across various industries, with a particular focus on the IT sector. Our findings indicate that increased board gender diversity within organizations significantly enhances sustainability outcomes. This research underscores the importance of agility as a crucial moderator that attenuates the positive effects of board gender diversity on sustainable business practices; that is to say, while gender diversity on boards is generally associated with enhanced sustainability practices, the presence of high agility within an organization may weaken this relationship. Our study contributes to the wider discourse on sustainable business practices and corporate governance, offering novel insights into how the interplay between board gender diversity and organizational agility can shape sustainability efforts.