Data is one of the key elements necessary to create inclusive financial systems around the world. With more and improved WFI data, policymakers can design and monitor WFI interventions, and financial service providers can build a business case for targeting women as clients. This strategy document from the Women’s Financial Inclusion Data (WFID) partnership argues that only through a unified and sector-wide approach to the collection, analysis and use of gender data will women’s full financial inclusion be realized.