A questionnaire consisting of items about abuse, neglect, self-mutilation and suicide attempt and the Turkish Version of the Dissociative Experiences Scale were given to 862 high school students. The rates of suicide attempt and self-mutilative behaviors were 10.1% and 21.4%, respectively. Abused or neglected groups (34.3%) had 7.6-fold higher suicide attempts and 2.7-fold higher self-mutilation behaviours. The logistic regression model showed that each type of trauma and dissociation contributed to suicide attempts and self-mutilation, but dissociation was the most powerful. Suicidal and self-destructive adolescents should precisely be evaluated for abuse, neglect and dissociation in clinical practice.