Over the past four decades, extreme wealth concentration has reshaped democratic societies, amplifying private power even as democratic institutions struggle to respond. This book offers a bold new framework for governing concentrated wealth - not as untouchable private property, but as a form of power that must be held accountable in the public interest. In Democratic Wealth Stewardship, Nancy S. Lind brings together insights from political theory, economics, law, and comparative case studies to examine how wealth accumulation, philanthropy, and corporate power affect democratic governance. Through empirical analysis and global examples of participatory innovation, the book shows how democratic institutions can steward wealth to support equity, innovation, and long-term public goods while resisting authoritarian capture. Written for scholars, policymakers, advocates, and engaged citizens, this book bridges normative theory and institutional design, offering concrete governance mechanisms for democracies confronting inequality, democratic erosion, and civilization-scale challenges. It argues that the future of democracy depends not on eliminating wealth, but on governing it democratically.