Joan, Countess of Blois

Joan of Châtillon (c. 1253–1292) was countess of Blois, Chartres and Châteaudun, the daughter of Count John I of Blois and Alix of Brittany. She married Peter of Alençon, son of King Louis IX, in 1272 and was widowed in 1283 with no surviving children. In 1286 she sold the county of Chartres to Philip IV of France.

She is remembered for opening hunting to all inhabitants. She died at Blois on 29 January 1292, leaving Blois to her cousin Hugh II of Châtillon.