How can states and schools use data to support their efforts to improve educational equity? "Building Educational Equity Indicator Systems: A Guidebook for States and School Districts," provides information to help state and school district leaders develop ways of tracking educational equity within their preK-12 systems. The guidebook expands on the indicators of educational equity identified in the 2019 National Academies report, "Monitoring Educational Equity," showing education leaders how they can measure educational equity within their states and school districts. Some of the indicators focus on student outcomes, such as kindergarten readiness or educational attainment, while others focus on student access to opportunities and resources, such as effective instruction and rigorous curriculum. Together, the indicators provide a robust picture of the outcomes and opportunities that are central to educational equity from preK through grade 12. For each indicator of educational equity identified in the report, the guidebook describes what leaders should measure and what data to use, provides examples of data collection instruments, and offers considerations and challenges to keep in mind. The guidebook is meant to help education leaders catalogue data they already collect and identify new data sources to help them fill gaps. [The guidebook was co-written with the Division of Behavioral and Social Sciences and Education and the Committee on National Statistics. For "Monitoring Educational Equity," see ED595713.]