Published online: 07 Jan 2019What did Rousseau's readers mean when they called him an 'Epicurean'? A seemingly simple question with complex implications. This article attempts to answer it by reconstructing Rousseau's contemporary reception as an Epicurean thinker. First, it surveys the earliest and most widely read critics of the second Discourse: Prussian Astronomer Royal Jean de Castillon, Jesuit priest Louis Bertrand Castel, and Hanoverian biblical scholar Hermann Samuel Reimarus. These readers branded Rousseau an Epicurean primarily to highlight his atheism, his anti-providential and materialist natural philosophy. Then, it discusses Genevan pastor Jacob Vernet's positive assessment of Rousseau as a critic of 'fashionable' Epicureanism...