This article was published in the Frontiers in Global Women's Health journal in April 2023. The article discusses how USAID's MOMENTUM Routine Immunization Transformation and Equity project recognized the need to mainstream gender into its global and country level work, incorporating gender considerations into all phases of the program cycle, from assessment to activity design, strategic communications, monitoring, evaluation, and continuous learning. The authors describe approaches the project has applied to build capacity of its own global and country level staff to both recognize the gender dimensions inherent in common obstacles to immunization and ways to address them.