Assuming that some moral variables can play a role in explaining intimate partner violence (IPV) and its treatment, this study explores the evolution of the relationship between some moral variables, which have recently been connected to IPV, and sexist attitudes in 160 men convicted of violence against the partner. The general hypothesis is that the moral variables can change during psychological treatments, and therefore be intervention targets, because they are related to more traditional variables in the field of IPV, such as sexist attitudes. To test this idea, we took pretreatment and posttreatment measures on moral variables (moral absolutism and moral foundations) and sexist attitudes (benevolent and hostile sexism) and analyzed their relationships and their changes after the completion of a prescribed psychological treatment. The results showed that (a) the moral variables were significantly correlated with the sexist attitudes before and after the treatment; (b) the men convicted of violence against the partner held with less certainty their general beliefs about morality and their particular beliefs about the binding moral foundations (in‐group, authority, and purity) after the unspecific psychological treatment; and (c) their moral absolutism before the treatment predicted the remaining sexist attitudes after the treatment. Practical implications can be drawn to better understand this kind of prevalent violence and eventually to improve the psychological treatments.