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. from Harvard University, where he was a student of Judith Shklar. He has taught at numerous universities including Princeton and is the author of many works of political philosophy including The Problems of a Political Animal.
He is currently the Lerman Neubauer Professor of Democracy and Public Policy at Brandeis University.