Saint-Brieuc ([sɛ̃ bʁijø], Breton: Sant-Brieg pronounced [sãnt ˈbriːɛk], Gallo: Saent-Berioec) is a city in the Côtes-d'Armor department in Brittany in northwestern France.

It also dates from the Middle Ages when the ‘pays de Saint Brieuc’, or Penteur, was established by Duke Arthur II of Brittany as one of his eight ‘battles’ or administrative regions.

In 2009, large amounts of sea lettuce, a type of alga, washed up on many beaches of Brittany, and when it rotted it emitted dangerous levels of hydrogen sulphide.

The Cemetery of Saint Michel contains graves of several notable Bretons, and sculptures by Paul le Goff and Jean Boucher.

Le Goff, who was killed with his two brothers in World War I, is also commemorated in a street and with his major sculptural work La forme se dégageant de la matière in the central gardens, which also includes a memorial to him by Jules-Charles Le Bozec and work by Francis Renaud.