Mental health conditions are increasingly recognized as a significant public health concern globally, and Bangladesh is no exception. Despite the rising prevalence of mental disorders, a substantial proportion of individuals do not receive appropriate care, contributing to a wide mental health treatment gap. Limited trained human resources, inadequate integration of mental health into primary healthcare, and insufficient service coverage at the district and upazila levels further exacerbate this gap. To address these challenges and strengthen mental health service delivery at the primary healthcare level, the Telepsychiatry Research and Innovation Network, in collaboration with the World Health Organization (WHO), the Directorate General of Health Services (DGHS), the National Institute of Mental Health (NIMH) and Hospital, and other stakeholders, implemented a comprehensive mhGAP training initiative in five selected districts: Sylhet, Chapainawabganj, Sherpur, Netrokona, and Kurigram. This 18-month initiative focused on building sustainable capacity among healthcare providers through a structured Training of Trainers (ToT) model followed by district-level mhGAP training and supportive supervision.