Tressignaux (French pronunciation: [tʁesiɲo]; Breton: Tresigne; Latin: Trisignala) is a commune in the Côtes-d'Armor department in the Brittany region in northwestern France.

The Chapel of Saint-Antoine, located in the village, was built in the thirteenth century and rebuilt in the sixteenth. Each year, a "pardon" is celebrated on the 3rd Sunday in August, attracting visitors to the village.

Inhabitants of Tressignaux are called tressignaulais in French.