Système de la Nature ou Des Loix du Monde Physique et du Monde Moral (bahasa Inggris: The System of Nature or, the Laws of the Moral and Physical World) adalah karya filsafat Paul Henri Thiry, Baron d'Holbach (1723-1789). Buku ini awalnya diterbitkan atas nama Jean-Baptiste de Mirabaud. Proses pembuatan dan penerbitan buku ini kemungkinan dibantu oleh Diderot.[1]
Dalam buku ini, Baron d'Holbach menggambarkan jagad raya dalam paham materialisme filsafat.[2]
^See Virgil V. Topazio, "Diderot's Supposed Contribution to D'Holbach's Works", in Publications of the Modern Language Association of America, LXIX, 1, 1954, pp. 173-188.
^System of Nature Vol. 1, Chap XI "Of the System of Man's free agency": "In despite of the gratuitous ideas which man has formed to himself on his pretended free-agency; in defiance of the illusions of this suppose intimate sense, which, contrary to his experience, persuades him that he is master of his will, -- all his institutions are really founded upon necessity: on this, as on a variety of other occasions, practice throws aside speculation."
