Coordinates: 48°56′15″N 2°07′39″E / 48.9375°N 2.1275°E / 48.9375; 2.1275
Le Mesnil-le-Roi is a commune in the Yvelines department in the Île-de-France region in north-central France. It is about 8 km (5 mi) from Saint-Germain-en-Laye.
The name "Mesnil" comes from Latin: mansionilis meaning "little estate". The name "Le Mesnil-le-Roi" could be said "The King's small estate" (Francis I). On the other hand, the name of Mesnil-le-Roi in the time of the French Revolution was Le Mesnil-Carrières, "Mesnil quarries".
The inhabitants are called Mesnilois (male) and Mesniloise (female).
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