Quality service delivery in Nigeria has experienced setbacks and challenges over the years, adversely affecting health outcomes, particularly for mothers and children. In response to these challenges, the project identified state advocacy, engagement, and capacity strengthening as critical areas for intervention. This brief summarizes support from MOMENTUM Country and Global Leadership to foster collaboration among stakeholders, enhance health worker skills and competencies, and improve health outcomes for mothers and children across all states in Nigeria. With combined efforts, partnerships, and collaborations from the Federal Ministry of Health and National Primary Health Care Development Agency (NPHCDA), advocacy plans, training modules, and schedules were developed for organized and effective trainings.