Crepaz N, et al. - Racial/ethnic differences in sustained viral suppression and transmission risk potential were examined among persons living with diagnosed HIV infection (PLWDH) aged 13–29 years. The National HIV Surveillance System reporting through December 2018 from 42 jurisdictions yielded data from 90,812 PLWDH aged 13–29 years for this analysis. Among these, 41.5% had sustained viral suppression in 2016. Across age, gender, and most transmission categories, the lowest prevalence of sustained viral suppression was observed among blacks. The average number of days with viral load > 1500 copies/mL was 206 days (56.4% of the 12-month period) among the 28,154 who were in care but without sustained viral suppression. Findings thereby suggest suboptimal sustained viral suppression and a high transmission risk potential for PLWDH aged 13–29 years.