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

[2] Its population is 105,848 (2021), and its area is 984.9 km2 (380.3 sq mi).

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