« de gueules au cor de chasse d'or, contourné et virolé d'argent ; au chef cousu d'azur, chargé d'une marguerite, boutonnée d'or, tigée et feuillée de sinople, accotée de deux feuilles de chêne d'or, celle à dextre posée en bande et celle à senestre posée en barre. L'écu sommé d'une couronne murale et accoté de deux branches de chêne naturel. »

The coat of arms of Le Vésinet was adopted by the town council on the 2 ^nd of August 1897 and made official by a municipal decree on the 2 ^nd of August 1898.

There were two projects, prior by about thirty years: the one of 1869 substituting the monogram S.M.V. (Sainte Marguerite du Vésinet), was initially accepted, portraying a "silver villa accompanied by two golden daisies". The motto that was then adopted was "robur et venustas", which means "force and beauty", chosen over the other motto "quercus marguaritis emicant", meaning "the oaks rise from the daisies".

The actual coat of arms, which was drawn by Eugène Bénard, second secretary of Le Vésinet's town hall, abandoned the "silver villa" and made the horn appear as a reference to the legend that has Roland blewing his instrument in Le Vésinet's forest where he was victim of Ganelon's treason. The oak leaf garland surrounding the shield is a symbol of the past as a forest of Le Vésinet. The daisy evokes Sainte-Marguerite, saint patroness of Le Vésinet, chosen by Alphone Pallu, creator of the commune, who even gave this name to his two daughters, Marie-Marguertie and Marguerite-Marie. The crown reminds that the forest was once part of the royal domain.