Callac (French pronunciation: [kalak] ^ⓘ; Breton: Kallag) is a commune in the Côtes-d'Armor department in Brittany in north-western France.

Callac is located 30 km (19 mi) south-west of Guingamp and 20 km (12 mi) north-east of Carhaix, Finistère.

Inhabitants of Callac are called Callacois in French.