This document, provided by SAMHSA, describes the use of Mobile Medication Units (MMUs) and Mobile Health Clinics (MHCs) to expand access to opioid use disorder (OUD) treatment. It highlights how these mobile units improve access to medications for opioid use disorder (MOUD), harm reduction services, and recovery supports in underserved areas. This resource is valuable for stakeholders seeking innovative solutions to address OUD in diverse community settings, emphasizing the importance of low-barrier, flexible care options.