The arrondissement of Belley is an arrondissement of France in the Ain department in the Auvergne-Rhône-Alpes region.

[2] Its population is 124,868 (2021), and its area is 1,584.2 km2 (611.7 sq mi).

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

[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 Belley were, as of January 2015:[6]