Established in 2015, the Global Financing Facility for Women, Children, and Adolescents (GFF) is a multistakeholder global partnership that mobilizes resources in order to help close gaps in funding to improve reproductive, maternal, newborn, child, and adolescent health and nutrition (RMNACH-N). This JCIE report, prepared with the support of the Bill & Melinda Gates Foundation, examines the unique, catalytic role that the GFF plays in strengthening the efforts of partner countries to improve primary health care (PHC) toward the achievement of universal health coverage (UHC). Through a comprehensive literature review and interviews with global health experts and GFF country contacts, this report provides an overview of the GFF’s work supporting PHC as well as more in-depth highlights of its work in supporting countries and their national health plans in three country cases: Côte d’Ivoire, Viet Nam, and Tajikistan.