Board diversity is crucial for corporate governance and improves corporate outcomes by aligning management with stakeholders’ interests. Compared to advanced environments, Jordan’s decent sociocultural backdrop exhibits a higher level of gender bias. This study investigates the influence of board gender diversity (BGD) on Jordanian banking sector performance, an under-explored area. This quantitative paper employs Ordinary Least Squares (OLS), random, and fixed-effect approaches to analyze 182 bank-year observations for balanced longitudinal data analysis. These approaches correctly establish the BGD-Tobin’s Q nexus during 2010–2022. The coefficient of determination was 70.57%. The model confirms a positive correlation between BGD and market-based performance indicators. Findings support agency and resource dependency hypotheses, showing BGD’s role in decision-making. Hence, a one-unit increase in BGD causes a 37.2-cent increase in Tobin’s Q measure. Moreover, a one-unit change in board independence, board meetings, size, women’s representation in top management, and capital adequacy ratio, assuming all other factors remain constant, results in Tobin-Q changes of 2.57 cents, 32.8 cents, 5.78 cents, 51.2 cents, 30.55 cents, and 22.86 cents, respectively, and the same direction. The results show how BGD enhances bank performance and contributes to relevant theories. The results are vigorous in a variety of identification and estimation methodologies.