'Union of the communities') is an Orthodox Jewish congregation and synagogue, located at 10 rue Pavée, in Le Marais quarter, in the IVe arrondissement of Paris, France.

[1] The synagogue was commissioned by the Agoudas Hakehilos (אֲגֻדָּת־הַקְּהִלּוֹת, union of the communities), society composed of Orthodox Jews of primarily Russian origin, headed by Joseph Landau.

The opening ceremony was not attended by any of the representants of the Central Consistory, instead famous polish Hazzan Gershon Sirota was present at the event.

Built on a narrow stripe of land between older houses, the synagogue is developed in height, with the elongated windows and continuous columns of its façade emphasizing its verticality.

The furnishings (luminaires, chandeliers, brackets, and benches) as well as the stylized vegetal decorations made of staff and the cast iron railings are all creations of Guimard and they display the same motifs that characterize the exteriors.