The authors examined prospective measures of psychosocial risk factors as predictors of severe intimate partner violence among a community sample of 610 young adults at risk for intergenerational transmission of depression. The hypothesized risk factors were youth history of depression by age 15 and maternal history of depression. Youth social functioning at age 15 was tested as a mediator of these associations. Results showed that youth history of depression by age 15 predicted victimization at age 20. Severe violence perpetration was predicted by maternal depressive history among women but not men. Youth social functioning was a partial mediator of both associations. In sum, the findings suggest that psychosocial factors observed in adolescence may contribute to the risk of experiencing severe intimate partner violence during young adulthood.