Blanche of Navarre, Duchess of Brittany

Blanche of Navarre, also called Blanche of Champagne (1226–1283), was the daughter of Theobald I, King of Navarre and Count of Champagne. In 1236 she married John I, Duke of Brittany, a match that briefly made John heir to the throne of Navarre.

She bore eight children, of whom only John II, Peter and Alix reached adulthood. In 1270 she founded the Abbey of La Joie near Hennebont, where she was buried after her death in 1283.