Boston Health Care for the Homeless Program (BHCHP) is seeking to expand access to medication for addiction treatment (MAT) for individuals without stable housing who are diagnosed with opioid use disorder (OUD) and are preparing to transition from Suffolk County jails to the community. ICH is the evaluator for this project funded by the Substance Abuse and Mental Health Services Administration (SAMHSA) and implemented by BHCHP. In this mixed methods evaluation, we will be gathering quantitative data from participants through the Center for Substance Abuse Treatment’s Government Performance and Results Act (GPRA) interview protocol, as well as gathering qualitative data from participants through focus groups. ICH is applying a health equity lens as we approach this evaluation, and will seek to work directly with BHCHP staff to adapt the evaluation to best fit their goals. Along with periodic reporting to SAMHSA, ICH will also assist BCHCP with other appropriate dissemination efforts to further their reach and expand their program.