The purpose of this study is to examine the relation between internationalization and firm sustainable performance on a set of listed Indian family firms belonging to mid‐cap and large cap categories and listed on NIFTY 500. This paper aims to explore the heterogeneity among internationalization and a set of defined variables, namely, female representation on the board, firm size, firm age, industry type, leverage, corporate social responsibility (CSR) and the number of female executives in influencing the firm performance. We aim to incorporate corporate governance, the factors influencing decisions related to it and gender diversity in understanding the relationship between internationalization and firm performance in the context of Indian family firms. The Generalized Method of Moments (GMM) and panel data regression models are both used in the study's empirical methodology. In order to examine the relationship between internationalization, as indicated by the percentage of foreign ownership, and family firm performance, as indicated by Return on Equity (ROE), the study uses the data from 2014 to 2023 for analysis, totaling 16,586 firm‐year observations. The findings indicate that internationalization, measured in this study by the investments the companies make abroad, positively affects the performance of the family firms. Age, women on board and number of female executives are seen to have positive associations with the performance of family firms. However, it is seen that firm size for family firms negatively impacts the performance while CSR and leverage seem to have no significant impact.