Allen Edward Buchanan is a moral philosopher. As of 2022, he held multiple academic positions: Distinguished Research Professor at the University of Arizona, Distinguished Research Fellow at Oxford University, Visiting Professor of the philosophy of international law at the Dickson Poon School of Law at King's College, London, and James B. Duke Professor Emeritus at Duke University. He has written six books covering such topics as Marx, applied ethics (especially bio-medical ethics), social justice, and international justice, including the foundations of international law.