Argenteuil (French: [aʁʒɑ̃tœj] (listen)) is a commune in the northwestern suburbs of Paris, France. It is located 12.3 km (7.6 mi) from the center of Paris. Argenteuil is a sub-prefecture of the Val-d'Oise department, the seat of the arrondissement of Argenteuil. Argenteuil is part of the Métropole du Grand Paris.

Argenteuil is the fourth most populous commune in the suburbs of Paris (after Boulogne-Billancourt, Saint-Denis, and Montreuil) and the most populous one in the Val-d'Oise department, although it is not its prefecture, which is shared between the communes of Cergy and Pontoise.

Argenteuil shares borders with communes in 3 departements others than Val d'Oise : the Yvelines, Hauts-de-Seine and Seine-Saint-Denis departements.