Extensive work has documented an association between sustaining intimate partner violence (IPV) and alcohol/drug abuse among women, yet little research has documented the same association in men, even though men comprise 25–50% of all IPV victims in a given year. This study investigates the associations among sustaining IPV and alcohol/drug abuse among both a clinical and community sample of men. The clinical sample is comprised of 302 men who sustained intimate terrorism—a form of IPV that is characterized by much violence and controlling behavior—from their female partners and sought help. The community sample is composed of 520 men, 16% of whom sustained common couple violence, a lower level of more minor reciprocal IPV. Analyses showed that among both groups of men who sustained IPV, the prevalence and frequency of alcohol/drug abuse was significantly higher than in men who did not sustain IPV. However, a dose–response relationship between sustaining IPV and alcohol/drug abuse was found only among men in the community sample. Path modeling showed that, for the community sample, the best fitting models were ones that showed that the alcohol/drug abuse predicted IPV victimization, an association that was fully mediated by their use of IPV. Aggr. Behav. 38:31-46, 2012. © 2011 Wiley Periodicals, Inc.