The arrondissement of Saint-Brieuc is an arrondissement of France in the Côtes-d'Armor department in the Brittany region.

[2] Its population is 274,111 (2021), and its area is 2,696.0 km2 (1,040.9 sq mi).

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