The arrondissement of Château-Gontier is an arrondissement of France in the Mayenne department in the Pays de la Loire region.

[2] Its population is 73,211 (2021), and its area is 1,527.4 km2 (589.7 sq mi).

[3] The communes of the arrondissement of Château-Gontier, and their INSEE codes, are:[2] The arrondissement of Château-Gontier was created in 1800, disbanded in 1926 and restored in 1942.

[5] 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 Château-Gontier were, as of January 2015:[6]