The COVID-19 Maternal Immunization Resource Library is a one-stop information hub linking to global and country-specific research, guidance, tools, publications, and other resources related to COVID-19 vaccines and pregnancy and/or breastfeeding. The tool is designed to support decision-makers, implementers, funders, advocates, and others working to advance COVID-19 maternal immunization by connecting them to the latest information on research, safety registries, vaccine safety and acceptance, pregnancy outcomes, and other topics. Information will be useful for stakeholders across vaccine; maternal, newborn, and child health; and other public health fields.