Saint-Maudez (French pronunciation: [sɛ̃ mode]; Breton: Sant-Maodez) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.

It is named after the Breton Saint Maudez.

St. Maudez is the tenth son of the King of Ireland Erelus (or Erelea or Ardea) and Gentuse or Getive, his wife.

Blazon = Carved: 1st of silver sown with shadows of ermine speckles with a line of azure, a lion gules crowned with gold debruising, 2nd of azure sown shadows of ermine speckles and at Saint Maudet bypassed halo issuant from the point and holding his episcopal crozier, all in shadow with the silver line.

Inhabitants of Saint-Maudez are called maudéziens in French.