Opioid use disorder (OUD) continues to represent a significant public health crisis in the United States, with substantial morbidity and mortality driven by overdose and limited access to effective treatment. Traditional clinic-based models of care often fail to engage individuals who face structural, social, and logistical barriers to treatment access. Field-based delivery of medications for opioid use disorder (mOUD) represents an emerging, evidence-based approach to expanding access to recovery-oriented resources and improving social service engagement among high-risk populations. This training will provide a comprehensive overview of mOUD implementation in field-based settings, including street medicine, outreach teams, and mobile health programs. Behavioral l health providers will review the pharmacologic foundations of mOUD, patient selection considerations, and harm reduction principles. Emphasis will be placed on practical strategies for initiating and maintaining treatment in non-traditional environments while addressing safety, regulatory, and ethical considerations for field-based medication assisted treatment.