This project adapts an intervention called Ending Self-Stigma (ESS), which has shown promising results in two large randomized controlled trials. The adapted intervention, called Ending Self Stigma: Medications for Justice-involved Populations (ESS-MJP), incorporates a psychosocial intervention directly addressing problematic anticipated stigma and internalized stigma around the use of Medications for Opioid Use Disorder (MOUD). This project supports adaptation and preliminary testing of the protocol for this intervention, and will develop manuals and associated materials to be tested in a future full-scale efficacy trial.