OBJECTIVES: To present the first national estimate of the sociodemographic, clinical, and behavioral characteristics of HIV-positive transgender men receiving medical care in the United States. METHODS: This analysis included pooled interview and medical record data from the 2009 to 2014 cycles of the Medical Monitoring Project, which used a 3-stage, probability-proportional-to-size sampling methodology. RESULTS: Transgender men accounted for 0.16% of all adults and 11% of all transgender adults receiving HIV medical care in the United States from 2009 to 2014. Of these HIV-positive transgender men receiving medical care, approximately 47% lived in poverty, 69% had at least 1 unmet ancillary service need, 23% met criteria for depression, 69% were virally suppressed at their last test, and 60% had sustained viral suppression over the previous 12 months. CONCLUSIONS: Although they constitute a small proportion of all HIV-positive patients, more than 1 in 10 transgender HIV-positive patients were transgender men. Many experienced socioeconomic challenges, unmet needs for ancillary services, and suboptimal health outcomes. Attention to the challenges facing HIV-positive transgender men may be necessary to achieve the National HIV/AIDS Strategy goals of decreasing disparities and improving health outcomes among transgender persons.