The culture of Brittany is the patterns of human activity and symbolism associated with the historical region of Brittany in northwestern France and the Breton people. Breton culture has been influenced by various local and nearby traditions over the centuries, including the Celtic culture of the Britons and Gauls and French culture to a lesser extent, particularly in Upper Brittany.
The languages traditionally spoken in Brittany are Breton, a Celtic language, and Gallo, a Romance language that forms part of the Langues d'oïl group. The region of Brittany used to be divided by an imaginary line into two subdivisions based on linguistic boundaries between Gallo and Breton. Upper Brittany is the area surrounding eastern Brittany, which is where the Gallo was predominant, and Lower Brittany is located in the west, where Breton was more widely spoken. It's worth noting the imaginary line has been constantly evolving due to Romance influence, but the line is considered to start in the commune Ploërmel. However, both languages have been on the decline in the region since the French Revolution, as the people who kept speaking them were seen as "counterrevolutionary" and the regional languages and dialects were heavily discouraged by the Government of France. Today, the main language of Brittany is French.