This project will adapt and pilot a feasible and effective problem-solving therapy designed for low-resource settings to address common mental disorders like depression and anxiety – the Friendship Bench– in a Vietnamese population of individuals living with HIV who also have opiate use disorder. The Friendship Bench approach has the potential to make an important contribution to address CMDs and reduce barriers to HIV treatment success among People living with HIV and Opiate Use Disorder, a critical population driving the HIV epidemic in Vietnam and many Southeast Asian countries. This proposal will generate critical evidence for designing a fully powered clinical trial to test our adapted FB protocol in improving HIV, mental health, and drug use treatment outcomes for this vulnerable population.