Essai sur l'inégalité des races humaines (Essay on the Inequality of the Human Races, 1853–1855) is a racist and pseudoscientific work of French writer Joseph Arthur, Comte de Gobineau, which argues that there are intellectual differences between human races, that civilizations decline and fall when the races are mixed and that the white race is superior. It is today considered to be one of the earliest examples of scientific racialism.
Expanding upon Boulainvilliers' use of ethnography to defend the Ancien Régime against the claims of the Third Estate, Gobineau aimed for an explanatory system universal in scope: namely, that race is the primary force determining world events. Using scientific disciplines as varied as linguistics and anthropology, Gobineau divides the human species into three major groupings, white, yellow and black, claiming to demonstrate that "history springs only from contact with the white races." Among the white races, he distinguishes the Aryan race, specifically the Nordic race and Germanic peoples, as the pinnacle of human development, comprising the basis of all European aristocracies. However, inevitable miscegenation led to the "downfall of civilizations".
Gobineau was a Legitimist who despaired at France's decline into republicanism and centralization. The book was written after the 1848 revolution when Gobineau began studying the works of physiologists Xavier Bichat and Johann Blumenbach.
The book was dedicated to King George V of Hanover (1851–66), the last king of Hanover. In the dedication, Gobineau writes that he presents to His Majesty the fruits of his speculations and studies into the hidden causes of the "revolutions, bloody wars, and lawlessness" ("révolutions, guerres sanglantes, renversements de lois") of the age.
In a letter to Count Anton von Prokesch-Osten in 1856 he describes the book as based upon "a hatred for democracy and its weapon, the Revolution, which I satisfied by showing, in a variety of ways, where revolution and democracy come from and where they are going.