In North America, the recent increase in opioid-related deaths has highlighted a need to consult people with Opioid Use Disorder (OUD) on how to improve treatments, namely in terms of service access and patient retention. The aim of this study is to explore experiential perspectives on how to improve accessibility and retention in OUD treatments. Four focus groups were conducted with a total of 27 people with former or current OUD, from treatment programs and community organizations located in Montreal, Canada. A thematic analysis was carried out based on Paill e and Mucchielli'sprocedure, and yielded the following main themes: outreach, flexibility, treatment opportunities, quality of life, comprehensive services, relationship with caregivers and autonomy. These findings provide interesting avenues for policy makers, program administrators and healthcare workers, and may help improving treatment access and retention.