The arrondissement of Saint-Nazaire is an arrondissement of France in the Loire-Atlantique department in the Pays de la Loire region.

[2] Its population is 345,185 (2021), and its area is 1,758.1 km2 (678.8 sq mi).

[3] The communes of the arrondissement of Saint-Nazaire, and their INSEE codes, are:[2] The arrondissement of Savenay was created in 1800.

[4] As a result of the reorganisation of the cantons of France which came into effect in 2015, the borders of the cantons are no longer related to the borders of the arrondissements.

The cantons of the arrondissement of Saint-Nazaire were, as of January 2015:[5]