Legal Positivism

Legal positivism is a family of theories in jurisprudence united by the separability thesis: the claim that there is no necessary connection between law and morality. A norm counts as law because it has been posited—enacted, decreed, or recognised through accepted institutional procedures—not because it is just. Positivists do not deny that laws can be morally evaluated; they insist that moral evaluation is a separate question from legal validity.

The tradition is usually traced to Jeremy Bentham (1748–1832) and his student John Austin, whose The Province of Jurisprudence Determined (1832) defined law as the command of a sovereign backed by sanctions. Twentieth-century positivism refined this picture in two major directions:

• H.L.A. Hart, in The Concept of Law (1961), replaced Austin's command theory with a system of primary and secondary rules unified by a rule of recognition—a social practice among officials that identifies which norms count as law.
• Hans Kelsen, in his Pure Theory of Law (German editions 1934 and 1960), grounded legal systems in a presupposed Grundnorm (basic norm) and sought to purge legal science of political and moral elements.

Contemporary debate divides positivists into inclusive (or "soft") positivists, like Hart in his postscript and Jules Coleman, who allow that a rule of recognition may incorporate moral criteria, and exclusive (or "hard") positivists, like Joseph Raz, who argue law's authority requires that its identification not depend on moral reasoning.

Positivism is typically contrasted with natural law theory (Aquinas, Finnis) and with Ronald Dworkin's interpretivism, which argues in Law's Empire (1986) that legal principles with moral content are part of the law itself. For international relations researchers, positivism is the dominant frame in international legal scholarship: it explains why treaties, custom, and the sources listed in Article 38 of the ICJ Statute are treated as binding regardless of their substantive justice.