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

It has 76 communes.

[2] Its population is 231,576 (2021), and its area is 3,157.4 km2 (1,219.1 sq mi).

[3] The arrondissement of Châteaubriant-Ancenis was created in January 2017 from the former arrondissements of Châteaubriant and Ancenis and 4 communes from the arrondissement of Nantes.

[4] The communes of the arrondissement of Châteaubriant-Ancenis are:[2]