One of the most prevalent forms of violence in contemporary society is the victimization of intimate partners. Although it has been established that homeless young people experience high levels of victimization on the street, little is known about partner violence (PV) experiences among this group, especially bidirectional violence. As such, the purpose of this study is to examine the prevalence of PV and bidirectional violence and to investigate risk factors and outcomes of this form of violence using a sample of homeless young adults. Overall, 59% of the sample experienced bidirectional violence. Multivariate results reveal that sexual abuse and neglect are significant correlates of PV. In addition, being either a victim or perpetrator of PV is associated with more severe substance use and higher levels of posttraumatic stress disorder (PTSD). Finally, there is support for bidirectional violence among homeless young adults even after controlling for early histories of maltreatment. (Contains 3 tables and 1 note.)