This Dictionary provides a wide range of coverage on a topic that has played a significant role in human society, from the early theoreticians and thinkers who proposed republican, democratic, and authoritarian innovations, to those who sought equality of classes, races, and genders, to those who insisted on hierarchy under a supreme leader, or god, and to those who had more practical economic, social, and ethical plans. This historical dictionary covers the most vital information on the persons, plans, and attempts associated with utopianism that have been seen since ancient times. An introductory essay, chronology, 600 dictionary entries, an extensive bibliography, and an appendix listing the names and locations of utopian communities worldwide enable the reader to explore the Western mind's desire to improve the world and the lives of the people within it as utopianism has persisted over the centuries.