The arrondissement of Foix is an arrondissement of France in the Ariège department in the Occitania region.

[2] Its population is 47,794 (2021), and its area is 1,793.8 km2 (692.6 sq mi).

[3] The communes of the arrondissement of Foix, and their INSEE codes, are:[2] The arrondissement of Foix 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 Foix were, as of January 2015:[6]