Milly-la-Forêt (French pronunciation: [miji la fɔʁɛ] ⓘ) is a commune in the Essonne department in the Île-de-France region in northern France.

The first name of this domaine was called Maurillac in Gaul, Mauriliaco on a Merovingien coin, became Maureliacum, Melliacum in 667, Milliacum in Latin.

The place name Milly is relatively current; it refers to an antic presence of a villa rustica owned during the Gallo-Romaine era by a certain Milius or Emilius.

Upon a request from the municipal council and by a statutory order from 6 February 1948, the name was replaced by Milly-la-Forêt, considered at that time as the most touristic place and to differentiate it from its homonym Milly in Normandy.

Milly contains several facilities: such as the Collège Jean Rostand, the Conservatoire des Deux Vallées, a gymnasium and sports ground complex, a multimedia library, a swimming pool, a bus station, dealers in craft products and so on.