Rocquencourt (French pronunciation: [ʁɔkɑ̃kuʁ] ⓘ) is a former commune in the Yvelines department in the Île-de-France in north-central France.

The commune is mainly known as the location of a research unit of INRIA (in the Domaine de Voluceau, formerly Camp Voluceau, used by SHAPE) as well as a freeway exchange known as the Rocquencourt Triangle (triangle de Rocquencourt, junction of the A12 autoroute and the A13 autoroute), which is often mentioned in traffic news.

On 1 July 1815, Napoleon's Grande Armée fought its last battle in Rocquencourt and Le Chesnay.

While negotiating the final armistice, Exelmans was ordered to attack the Prussians at Versailles on 1 July 1815.

Under attack the Prussians retreated from Versailles and headed east, but were blocked by the French at Vélizy.