Examining literary and philosophical writing about ideal societies from Greek antiquity to the present, this book offers a striking new take on utopia's fundamental project. Noting that utopian imagining has often been propelled by an angry conviction that society is badly arranged, the book argues that utopia's essential aim has not been to secure happiness, order, or material goods, but rather to establish a condition of justice in which all have what they ought to have. The book also makes the case that hostility to utopias has frequently been associated with a fear that they will transform humanity beyond recognition, doing away with the very subjects who should receive justice in a transformed world. Further, the book shows how utopian writing speaks to contemporary debates about immigration, labor, and other global justice issues. Along the way, the book connects utopia to the Greek concept of nemesis, or indignation at a wrong ordering of things, and advances fresh readings of dozens of writers and thinkers — from Plato, Thomas More, Nathaniel Hawthorne, Edward Bellamy, Charlotte Perkins Gilman, and H. G. Wells to John Rawls, Robert Nozick, Fredric Jameson, Ursula Le Guin, Octavia Butler, and Chang-Rae Lee. The book offers a vital reconsideration of what it really means to imagine an ideal society.