Background:People who inject drugs (PWID) are at higher risk for HIV and may have lower access to care and treatment services when infected. We aimed to assess the HIV continuum of care among PWID in Iran. Methods:We collected data from 2,663 PWIDwho self-reported injection drug use at least once during the past 12 months. They were recruited via respondent-driven sampling to a national bio-behavioral surveillance survey from 11 cities of Iran between June 2019 and March 2020. For participants who were tested positive for HIV in the survey, we asked questions to calculate the proportionwho were 1) aware of their HIV status, 2) linkage to HIV care, 3) initiated an HIV treatment anti-retroviral therapy (ART), 4) retention on ART and 5) virally suppressed (< 1000 copies/mL).Results:Out of 95 PWID were tested positive for HIV, 100% (95% Confidence Intervals (CI): 96,100%) reported that they were aware of their HIV positive status, 57% (95% CI: 46, 66%) were linked to an HIV care service and initiated ART, 49% (95% CI: 39, 59%) retained on ART and only 15% (95% CI: 8, 23%) had viral load less than 1000 cp/ml.Conclusion:Our results indicated that about half of the PWID diagnosed with HIVever started ART, and less than one in six were virally suppressed.Strategies to improve linkage to ART programs, and to improve ART retention and adherence may improve HIV care outcomes among PWID in Iran.