This paper explores the mediating role of post-traumatic stress symptoms in the association between sexual abuse and different forms of victimization in dating relationships. The study is based on the Quebec Youth Romantic Relationships Survey, a survey that explores victimization experiences, including childhood sexual abuse, and any emotional, physical, and sexual dating violence in the past 12 months. The sample involved 8,194 students at 34 secondary schools in Quebec. Post-traumatic stress symptoms were evaluated by means of the UCLA PTSD Index. 15 % of girls and 4 % of boys reported a history of child sexual abuse. Path analyses suggest that sexual abuse is positively associated with post-traumatic stress symptoms, which in turn are associated with psychological, physical, and sexual victimization of dating partners. The study has significant implications for prevention of and intervention in dating violence involving victims of sexual abuse.