John Mitchell Finnis

Australian legal scholar

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June 17, 2026

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John Finnis is an Australian legal scholar and Thomist philosopher known for his critique of legal positivism. He argues that a theory of law must identify its central cases, which for Finnis are those where there is a genuine moral obligation to obey. This contrasts with legal positivists like H.L.A. Hart, who believed central cases could be identified without regard to moral quality.1

Finnis's approach addresses the "problem of the Nazis," questioning how to categorize a legal system that authorized immoral actions. He contends that Nazi law was not a central case of law, making prosecution for those actions morally proper. This perspective separates his view from legal positivists who distinguish between the existence of law and its moral justness.2

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philosophy of law
John Finnis
John Finnis took a more-ambitious philosophical tack against positivism than Dworkin did. He argued that any theory of a social phenomenon, including law, must identify its “central” cases, since the goal of any theory is to describe the central or important features of…
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John Finnis took a more-ambitious philosophical tack against positivism than Dworkin did. He argued that any theory of a social phenomenon, including law, must identify its “central” cases, since the goal of any theory is to describe the central or important features of…
Read More

ethics
Moral realism
… (1980), by the legal philosopher John Finnis, was a modern explication of the concept of natural law in terms of a theory of supposedly natural human goods. Although the book was acclaimed by Roman Catholic moral theologians and philosophers, natural law ethics continued to have few followers outside these circles.…
Read More
… (1980), by the legal philosopher John Finnis, was a modern explication of the concept of natural law in terms of a theory of supposedly natural human goods. Although the book was acclaimed by Roman Catholic moral theologians and philosophers, natural law ethics continued to have few followers outside these circles.…
Read More