Guermantes (French pronunciation: [ɡɛʁmɑ̃t] ⓘ) is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.

It is located in the Val de Bussy sector of Marne-la-Vallée.

Writer Marcel Proust adopted its name for the origin of the Guermantes family in À la recherche du temps perdu.

Proust Scholar Joshua Landy points out that the only reason Proust "used it in his novel is that no living members of the family remained.”[3] Inhabitants are called Guermantais.

[4] Junior high school students attend Collège Léonard de Vinci in Saint Thibault des Vignes.