A strong and enduring commitment to liberalism marks much of urban policy discourse in the United States. Although this Liberal Urban Policy compares favorably with its neoliberal and neoconservative rivals, it is nevertheless deeply flawed. One particularly serious problem is its strong commitment to rationalism. I offer a critique of this Rationalist Paradigm at the core of Liberal Urban Policy, which is extensively developed along both normative and empirical dimensions. In light of this critique, I conclude by gesturing toward a possible alternative—an Organic Paradigm—that might conceivably serve as a superior foundation for American urban policy in the twenty-first century.