Drawing on upper-echelon, imprinting, and agency theories, this paper investigates the influence of founder CEOs’ clan cultural values on family firms’ green innovation performance and examines the moderating roles of family involvement and the intensity of government environmental regulation. Using data from 1678 Chinese public family firms over the period from 2012 to 2020, which include 9048 firm–year observations, our results show a significant positive effect of founder CEOs’ clan cultural values on firms’ green innovation practices. Additionally, this positive effect is weakened when the level of family involvement is high, due to conflict. Moreover, the positive influence is strengthened when government environmental regulation is more stringent.