Mental health conditions among people living with HIV (PLWH) are important to address as they adversely affect quality of life, impede adherence to HIV treatment and increase mortality. Planning for integrating mental health care in resource-limited HIV care settings requires substantial effort. Learning networks are a useful way to exchange knowledge between countries about best and current practices in planning mental health care for PLWH. This paper describes the launch of a mental health learning network within a global health implementing center and the lessons learned across participating members from six countries: the United States, Jamaica, Trinidad and Tobago, Zimbabwe, Malawi and India. Lessons learned from the learning network sessions spanned four broad domains: (i) the need for routine and integrated mental health data collection, (ii) developing standardized protocols to implement mental health care, (iii) adequate training and supervision of health care staff and (iv) prioritization of mental health care integration by program funders. We find that time and resource constraints can be barriers to shared leadership and sustainability of learning networks. Prioritizing learning networks as an important component of integrated HIV and mental health care programs is one of the potential strategies to ensure long-term continuity.