The Hart-Fuller debate is of great importance in contemporary legal philosophy for several reasons. It can be considered the starting point for the revival of the tradition of legal positivism, which attempts to separate moral norms from the nature of law. The debate took place over two articles and a book by Hart, and an article, a book, and a book appendix by Fuller. Although the debate between these two philosophers covers a wide range of fundamental issues in legal philosophy, and has become, according to some philosophers, the criterion for distinguishing positivist theories from natural law theories, all these disputes are in fact due to the disagreement between the two over the idea of separation of law and moral norms. In this paper, after a brief historical account of the views of natural law and legal positivism, we have attempted to reconstruct the debate between these two legal philosophers based on the aforementioned sources, in four issues: 1- the nature of law, 2- legal interpretation, 3- positivism and meta-ethics, and 4- the scope and nature of the knowledge of legal philosophy. As we shall see, in some issues Hart's arguments seem more convincing, and in others Fuller's arguments, and in some issues both arguments are convincing enough, and the dispute continues between the proponents of the two.
Austin, J. (1832). The Province of Jurisprudence Determined. Legal classics library. J. Murray.
Bix, B. (2010). Natural Law Theory. In D. M. Patterson & D. M. Patterson (Eds.), Blackwell companions to philosophy: Vol. 8. A companion to philosophy of law and legal theory (2nd ed.: 209–227). Chichester: Wiley-Blackwell. https://doi.org/10.1002/9781444320114.ch13
Campbell, T. (2004). Prescriptive legal positivism: Law, rights and democracy. London: UCL Press.
Conklin, W. E. (2001). The Invisible Origins of Legal Positivism: A Re-Reading of a Tradition (1st ed.). Law and Philosophy Library: Vol. 52. Dordrecht: Springer Netherlands.
Cuffaro, M. (2011). ON THOMAS HOBBES'S FALLIBLE NATURAL LAW THEORY. History of Philosophy Quarterly, 28(2), 175–190.
Dworkin, R. (1978). Taking Rights Seriously: With a New Appendix, a Response to Critics. Harvard paperback. Harvard University Press.
Dworkin, R. (2004). Hart's Postscript and the Character of Political Philosophy. Oxford Journal of Legal Studies, 24(1), 1–37. https://doi.org/10.1093/ojls/24.1.1
Fuller, L. L. (1956). I. Human Purpose and Natural Law. The Journal of Philosophy, 53(22), 697. https://doi.org/10.2307/2022413
Fuller, L. L. (1958). Positivism and Fidelity to Law: A Reply to Professor Hart. Harvard Law Review, 71(4), 630–672. https://doi.org/10.2307/1338226
Fuller, L. L. (1969). The morality of law: Revised Edition (Rev. ed., [14th print.]). Yale paperbounds: Vol. 152. New Haven [etc.]: Yale U.P.
Gardner, J. (2001). Legal Positivism: 51/2 Myths. The American Journal of Jurisprudence, 46(1), 199–227. https://doi.org/10.1093/ajj/46.1.199
Gomez, J. V. (2014). The Hart‐Fuller Debate. Philosophy Compass, 9(1), 45-53. https://doi.org/10.1111/phc3.12096
Gowans, C. (2021). Moral Relativism. In E. N. Zalta (Ed.), The Stanford Encyclopedia of Philosophy (2021st ed.). Metaphysics Research Lab, Stanford University.
Green, Leslie. (2008). Positivism and the Inseparability of Law and Morals. NYUL Rev.83: 1035.
Green, L. (2010). Law as a Means. In P. Cane (Ed.), The Hart-Fuller debate in the twenty-first century (pp. 169–188). Oxford, Portland: Hart Pub.
Green, L., & Adams, T. (2019). Legal Positivism. In E. N. Zalta (Ed.), The Stanford Encyclopedia of Philosophy (2019th ed.). Metaphysics Research Lab, Stanford University.
Hart, H. L. A. (1958). Positivism and the Separation of Law and Morals. Harvard Law Review, 71(4), 593–629. https://doi.org/10.2307/1338225
Hart, H. L. A. (1982). Essays on Bentham: Studies in Jurisprudence and Political Theory. Clarendon Press.
Hart, H. L. A. (2012). The Concept of Law (3rd ed.). Clarendon Law Series. Oxford: Oxford University Press.
Joyce, R. (2016). Moral Anti-Realism. In Edward N. Zalta (Ed.), The Stanford Encyclopedia of Philosophy (2016th ed.). Metaphysics Research Lab, Stanford University.
Kelsen, H. (1937). The Philosophy of Aristotle and the Hellenic-Macedonian Policy. International Journal of Ethics, 48(1), 1–64. https://:doi.org/10.1086/intejethi.48.1.2989300
Kelsen, H. (1957). Aristotle's DOCTRINE OF JUSTICE. In H. Kelsen (Ed.), What is Justice? Justice, Law, and Politics in the Mirror of Science (2020th ed.: 110–136). Berkeley, CA: University of California Press. https://doi.org/10.1525/9780520311336-005
Kelsen, H. (1960). Plato and the Doctrine of Natural Law. Vanderbilt Law Review, 14(1), 23.
King: (Ed.) (2007). Routledge encyclopedia of philosophy online: All site license & consortia/. [Place of publication not identified]: Routledge. https://doi.org/10.4324/9780415250696
Lacey, N. (2006). A Life of H.L.A. Hart: The Nightmare and the Noble Dream. Oxford University Press.
MacGuigan, M. R. Law, Morals, and Positivism. The University of Toronto Law Journal, 14(1), 1. https://doi.org/10.2307/825383
Maguire, J. P. (1947). Plato’s Theory of Natural Law. Yale University Press Geoffrey Cumberledge, Oxford University Press.
Marmor, A. (2006). Legal Positivism: Still Descriptive and Morally Neutral. Oxford Journal of Legal Studies, 26(4), 683–704. https://doi.org/10.1093/ojls/gqi028
Miller, F. D. [Fred D.] (2015). Aristotle’s Philosophy of Law. In F. D. Miller & C.-A. Biondi (Eds.), A Treatise of Legal Philosophy and General Jurisprudence (pp. 79–110). Dordrecht: Springer Netherlands.
Miller, F. D. [Fred Dycus] (1997). Nature, Justice, and Rights in Aristotle’s Politics. Oxford University Press.
Murphy, M. C. (1995). Was Hobbes a Legal Positivist? Ethics, 105(4), 846–873. https://doi.org/10.1086/293755
Posner, R. (1986). Legal Formalism, Legal Realism, and the Interpretation of Statutes and the Constitution. Case Western Reserve Law Review, 37(2), 179.
Priel, D. (2013). Reconstructing Fuller’s argument against legal positivism. Canadian Journal of Law & Jurisprudence, 26(2), 399-413. https://doi.org/10.1017/S0841820900006123
Raz, J. (1999). Practical Reason and Norms. OUP Oxford.
Rommen, H. A. (1998). The Natural Law: A Study in Legal and Social History and Philosophy. Liberty Fund.
Shapiro, S. J. (2006). What is the internal point of view. Fordham L. Rev., 75, 1157.
Shellens, M. S. (1959). Aristotle on Natural Law. American Journal of Jurisprudence, 4(1), 72–100. https://doi.org/10.1093/ajj/4.1.72
Van Roojen, M. (2018). Moral Cognitivism vs. Non-Cognitivism. In E. N. Zalta (Ed.), The Stanford Encyclopedia of Philosophy (2018th ed.). Metaphysics Research Lab, Stanford University.
Vega Gómez, J. (2011). The Hart-Fuller Debate Re-Revisited, 2(1), 261–271. https://doi.org/10.5235/204033211796290209
Vega Gómez, J. (2014). The Hart-Fuller Debate. Philosophy Compass, 9(1), 45–53. https://doi.org/10.1111/phc3.12096
Wild, J. D. (1953). Plato’s Modern Enemies and the Theory of Natural Law. University of Chicago Press.
Zagorin: (2009). Hobbes and the Law of Nature. Princeton University Press.
Articles in Press, Accepted Manuscript Available Online from 22 June 2025
Rafiealavy, E. and Khorrampanah, Y. (2025). A Critical and Comparative Study of Hart and Fuller's Debate on the Relationship Between Law and Ethics. Comparative Law Review, (), 221-239. doi: 10.22059/jcl.2024.364100.634539
MLA
Rafiealavy, E. , and Khorrampanah, Y. . "A Critical and Comparative Study of Hart and Fuller's Debate on the Relationship Between Law and Ethics", Comparative Law Review, , , 2025, 221-239. doi: 10.22059/jcl.2024.364100.634539
HARVARD
Rafiealavy, E., Khorrampanah, Y. (2025). 'A Critical and Comparative Study of Hart and Fuller's Debate on the Relationship Between Law and Ethics', Comparative Law Review, (), pp. 221-239. doi: 10.22059/jcl.2024.364100.634539
CHICAGO
E. Rafiealavy and Y. Khorrampanah, "A Critical and Comparative Study of Hart and Fuller's Debate on the Relationship Between Law and Ethics," Comparative Law Review, (2025): 221-239, doi: 10.22059/jcl.2024.364100.634539
VANCOUVER
Rafiealavy, E., Khorrampanah, Y. A Critical and Comparative Study of Hart and Fuller's Debate on the Relationship Between Law and Ethics. Comparative Law Review, 2025; (): 221-239. doi: 10.22059/jcl.2024.364100.634539