Le Pecq (French pronunciation: [lə pɛk] ⓘ) is a commune in the Yvelines department in the Île-de-France region in north-central France.

The commune of Le Pecq is located in a loop of the Seine river, 19 km (12 mi) west of Paris, at the foot of the chateau of Saint-Germain-en-Laye.

Le Pecq's territory is astride the two banks of the Seine and includes a small island, Corbière.

It is highly urbanized except for Corbière island, which is partially protected as a nesting zone for migratory birds.

In that year, the Merovingian king Childebert III granted a charter to Fontenelle Abbey which included territory in Aupec - the modern Le Pecq.