SUMMARY
This paper aims to explain how the relationship between law and morality in the H.L Hart and Fuller debate. The relationship between law and morality in the development of legal science is inseparable from legal and morality debates. Legal positivism scientists place law and morals separately, while natural law scientists place law and morals as inseparable. In this case, the author tries to recall how the post-World War II conditions were shocked by the debate between British legal scientists and American legal scientists, namely H.L.A Hart and Lon Fuller.