From March 18–19, 2024, the United States Agency for International Development (USAID) hosted an Immunization Partners’ Meeting convening USAID Missions, implementing partners including USAID MOMENTUM, and external stakeholders at a critical moment for the global immunization community. This booklet contains abstracts submitted by USAID implementing partners for an Innovation and Learning Marketplace that took place during the event. The purpose of this marketplace was to create space for USAID and implementing partners to deepen technical exchange on ongoing and emerging challenges in the immunization field and share innovative ideas, approaches to addressing these challenges and lessons learned.