The purpose of this study was to investigate the mediating effect of embitterment in the relations between victimization of gender discrimination and cyber violence of women in their 20s. For this purpose, participants were recruited from online websites and social network services commonly used by female adults. The self-report data of 249 participants was analyzed. The results indicate that victimization of gender discrimination did not have a direct effect on cyber violence; however, the mediating effect of embitterment was significant in the relationship between victimization of gender discrimination and cyber violence. In other words, although womens’ experience of receiving unfair treatment due to their gender status did not predict the perpetration of cyber violence by itself, it contributed to the perpetration of cyber violence through increased embitterment.