In the twenty-first century, gender-responsive budgeting (GRB) has emerged as a development tool that explores if and how gender equality goals and targets are being effectively supported through government funding. Gender-Responsive Budgeting in Practice: Lessons from Nigeria and Selected Developing Countries argues that, although justified by the high costs of gender inequality to economic growth and development, the use of GRB as a tool to achieve global and regional gender equality goals has seen little progress in the twenty-first century, especially in developing countries. Through analyses of government budgets and the budgeting process, and gender equality outcomes in Nigeria and the selected countries from 2000 to 2020, the contributors show that GRB has failed to gain traction or thrive in developing countries. Using these analyses, the contributors identify critical success factors that are missing in policy-making and planning in the developing world and must be integrated in order to further facilitate inclusive growth and sustainable development.