Argentonnay () is a commune in the Deux-Sèvres department of western France. The municipality was established on 1 January 2016 and consists of the former communes of Argenton-les-Vallées, Le Breuil-sous-Argenton, La Chapelle-Gaudin, La Coudre, Moutiers-sous-Argenton and Ulcot.
Population data refer to the area corresponding with the commune as of January 2025.