This technical brief will be useful to HIV programme managers in health ministries and other adolescent-related line ministries, especially those in low- and middle-income countries in sub-Saharan Africa, in implementing, monitoring and evaluating peer-based and adolescent-responsive and -friendly services for adolescents living with HIV. The publication will also be a valuable resource for healthcare workers and will assist international organizations, nongovernmental organizations and other implementing partners in better contextualizing, planning and delivering peer-based and adolescent-responsive and -friendly services for adolescents living with HIV. It briefly describes the criteria and standards for providing adolescent-friendly health services, summarizes some of the key peer-based implementation evidence, details examples and key characteristics of five peer-based adolescent service delivery models and offers programmatic considerations for providing adolescent-responsive and -friendly services to ensure meaningful engagement of adolescents as a key focus.