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Introduction Despite the effectiveness of opioid agonist therapy (OAT) for treating patients with opioid use disorder (OUD), insufficient education remains a barrier to prescribing. Internal medicine (IM) residents are optimally positioned to facilitate use of OAT, especially in the inpatient setting. We implemented an educational intervention aimed at increasing IM residents' knowledge and confidence regarding prescribing OAT to inpatients with OUD. Methods We created a 35-minute, case-based presentation highlighting the management of opioid withdrawal using OAT and treating pain in inpatients on maintenance OAT. It was presented to IM residents beginning their general medicine ward rotations from November 2019 through January 2020. We developed a survey to measure participants' knowledge (mean number of questions correct out of five) and confidence (mean Likert-scale score, 1 = Not at all confident, 5 = Extremely confident, on each of five items) regarding prescribing OAT in the inpatient setting. We compared knowledge and confidence before versus 1 month after the intervention using paired Student t tests, with p < .05 indicating significance. Results Of 103 unique residents completing ward rotations, 29 (28%) completed both the pre- and 1-month postsurveys and were included in the analysis. The mean number of knowledge questions correct increased from 3.1 pre- to 4.3 postintervention, and mean confidence scores increased from below 2 pre- to over 3 postintervention in four of five items (ps < .001). Discussion A brief, generalizable, educational intervention significantly increased residents' knowledge of and confidence in prescribing OAT in inpatients with OUD.