Goursez Vreizh (officially Breudeuriezh Drouized, Barzhed hag Ovizion Breizh) is the national gorsedd of Brittany ("Breizh" in Breton).

It often has delegates from the Welsh gorsedd and Gorsedh Kernow in Cornwall.

The Breton organisation is itself based on the Welsh-based Gorsedd, which was founded by Iolo Morganwg in 1792.

Théodore Hersart de la Villemarqué (1815-1895) was the first Breton to be made an initiate by the Gorsedd of Wales.

He created a "Fraternity of the Bards of Brittany" (Breuriez Breiz) but this did not lead to the creation of a Gorsedd.