Bernard Yack (born 1952) is a Canadian born American political theorist. He received his B.A. from the University of Toronto and his Ph.D. in Philosophy from Harvard University, where he was a student of Judith Shklar. Yack has taught at numerous universities including Princeton University and the University of Wisconsin–Madison. He is the author of works of political and social philosophy such as The Problems of a Political Animal, and The Longing for Total Revolution: The Philosophic Sources of Social Discontent from Rousseau to Marx and Nietzsche. His most recent book is titled Nationalism and the Moral Psychology of Community. He is currently the Lerman Neubauer Professor of Democracy and Public Policy at Brandeis University.