The Fatal Conceit: The Errors of Socialism is a book written by the economist and political philosopher Friedrich Hayek and edited by the philosopher William Warren Bartley. The book was first published in 1988 by the University of Chicago Press. Economic historian Bruce Caldwell has questioned how far Bartley was the editor and how far the author. The title of the book is a reference to a passage from Adam Smith, in his The Theory of Moral Sentiments (1759).