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Opioid agonist therapies (OAT) for people with opioid use disorders (OUD) have been available in Ukraine since 2004. This study assessed the effect of 2014 Russian invasion of Ukraine on OAT re-enrollment and retention in conflict areas. We analyzed the Ukraine national registry of OAT patients containing 1868 people with OUD receiving OAT as of January 2014 in conflict areas (Donetsk, Luhansk, and the Autonomous Republic [AR] of the Crimea). We developed logistic regression models to assess the correlates of re-enrollment of OAT patients in government-controlled areas (GCA) from conflict areas and retention on OAT at 12 months after re-enrollment. Overall, 377 (20.2 %) patients were re-enrolled at an OAT site in a GCA from confict areas, of whom 182 (48.3 %) were retained on OAT through 2021. Correlates of re-enrollment were residing in Donetsk (adjusted odds ratios (aOR) = 7.06; 95 % CI: 4.97–10.20) or Luhansk (aOR = 6.20; 95 % CI: 4.38–8.93) vs. AR Crimea; age 18–34 (aOR = 2.03; 95 % CI: 1.07–3.96) or 35–44 (aOR = 2.09; 95 % CI: 1.24–3.71) vs. ≥55 years, and being on optimal (aOR = 1.78; 95 % CI: 1.33–2.39) or high OAT dosing (aOR = 2.76; 95 % CI: 1.93–3.96) vs. low dosing. Correlates of retention were drug use experience 15–19 years (aOR = 3.69; 95 % CI: 1.47–9.49) vs. <14 years of drug use; take-home (aOR = 3.42; 95 % CI: 1.99–5.96) vs. daily on-site dosing, and optimal (aOR = 2.19; 95 % CI:1.05–4.72) vs. low OAT dosing. Our study showed that one-fifth of patients were re-enrolled at sites in GCA areas, less than half of re-enrolled patients were retained. Disruption of OAT has implications for drug-, HIV-, and HCV-related morbidity and mortality. AM was funded by NIH-funded grant D43TW010562; DCO was funded by the NIDA-funded Center for Drug Use and HIV|HCV Research (P30DA011041). • One-fifth of OAT patients were successfully referred to sites in non-conflict areas. • The odds of successful referral were greater for younger patients. • Less than half of OAT patients successfully referred were retained on treatment. • Retention was associated with higher dosing and more flexible methods of dosing. [ABSTRACT FROM AUTHOR]