Tressignaux (; ; ) 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.