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Importance: Hepatitis C virus (HCV) care cascade data by race/ethnicity for US correctional populations are sparse. Objective: To evaluate the HCV care cascade by race/ethnicity for a state correctional population. Design, Setting, and Participants: This retrospective cohort study used Connecticut Department of Correction data for incarcerated individuals tested, diagnosed, and treated for chronic HCV infection with direct-acting antivirals (DAAs) from 2019 to 2023. Main Outcomes and Measures: HCV care cascade outcomes, including testing, treatment, and cure rates, were compared by race/ethnicity. Poisson regression was used to estimate prevalence ratios (PRs), with adjustment for demographic and legal status factors. Results: A total of 24,867 patients tested for HCV (88.9% men, mean (SD) age 35.6 (11.8), 32.7% White, 37.9% Black, 28.4% Hispanic, 0.6% Asian, 0.4% American Indian/Alaska Native (AIAN), 34.7% sentenced ≥ 1 year). Both HCV exposure and chronic HCV were highest for White (27.1% and 15.2%) and lowest for Black individuals (4.6% and 2.6%) (P< 0.01, for both outcomes). While incarcerated, 63.2% of chronic HCV patients started DAAs, and treatment rates did not significantly differ by race/ethnicity (P> 0.05). For those treated and having post-treatment lab data available, cure rates were 98.8% or better for all racial/ethnic groups (P> 0.05). In the adjusted regression analyses, HCV treatment initiation was lower for those sentenced < 1 year (PR, 0.76; 95% CI, 0.67–0.87) and unsentenced (PR, 0.85; 95% CI, 0.80–0.91) than those sentenced ≥ 1 year. The adjusted prevalence of advanced fibrosis stage/activity grade was not significantly associated with race/ethnicity. Conclusions: In this cohort study, less than two-thirds of chronic HCV patients initiated DAA treatment during their incarceration, and for those with available data, nearly all were cured. While there were disparities in HCV exposure and chronic HCV infection, significant racial/ethnic differences were not observed for treatment initiation or cure rates. Further efforts are needed to increase HCV treatment, especially for patients with shorter incarceration periods.