Philippe Guéneau de Montbeillard also Philibert Guéneau de Montbeillard (2 April 1720 – 28 November 1785[1]) was an eighteenth-century French lawyer, writer, naturalist, and contributor to the Encyclopédie.
He later lived for around a decade in Paris, where he befriended Denis Diderot, a co-editor of the Encyclopédie.
Gueneau contributed a single article to that work, "Étendue", a philosophical treatment of the notion of extension.
"[5] In 1766 Gueneau inoculated his son against smallpox, a controversial procedure at the time, and announced the success of the operation in a paper read to the Académie des Sciences, Arts et Belles-Lettres de Dijon.
In 1764 he was elected a member of the Académie des Sciences, Arts et Belles-Lettres de Dijon.