Ermengarde of Anjou, Duchess regent of Brittany (born 1068)

Ermengarde of Anjou, also known as Ermengarde of Brittany, was a member of the comital House of Anjou and by her two marriages was successively Duchess of Aquitaine and Brittany. She was also a patron of Fontevraud Abbey. Ermengarde was the regent of Brittany during the absence of her spouse, Duke Alan IV of Brittany, from 1096 until 1101.