Ambivalent sexism has served to justify and maintain patriarchy and traditional gender roles characterized by inequality and male domination in the intimate partner violence (IPV) literature; according to the Moral Foundation Theory (MFT) there are two specific moral foundations related to inequality and domination: fairness and authority. We connect these separate fields arguing that sexist attitudes can be related to specific patterns of endorsement of the five moral foundations. Our hypothesis is that ambivalent sexism in men convicted of violence against the partner may be rooted in at least these two moral foundations, and that at least these two moral foundations may also serve to predict intention to change the violent behavior against the partner. Controlling for political orientation, the results show that benevolent sexism correlates positively with the authority foundation; and hostile sexism correlates negatively with the fairness foundation. Both foundations contribute to explaining the two dimensions of ambivalent sexism (benevolent and hostile) and only the fairness foundation predict intention to change the violent behavior against the partner. New treatment approaches could be designed to increase moral concerns about fairness and to reduce moral concerns about authority in people who, at least, have once used violence against their partners.