Young people have the right to live healthy sexual and reproductive lives. Yet, adolescents and youth (those between the ages of 10 and 24) often face social, cultural, economic, and structural barriers to accessing sexual and reproductive health information and services at a time when they need these services the most, making them vulnerable to poor health outcomes. Emerging global guidance suggests that, to reach youth in a sustainable and scalable way, youth-friendly services must be mainstreamed in the community and health systems. However, there is little evidence from project implementation about how to integrate youth-friendly services on a large scale. This technical brief explores how youth-friendly services were mainstreamed within public sector facilities and communities supported by Pathfinder International’s cross-country project, MAIS Qualidade, Acesso, Saúde in Mozambique, and Chaguo la Maisha in Tanzania (January 2015 to December 2017), and offers recommendations for future youth-friendly services programming.