| Ermengarde of Anjou | |
|---|---|
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| Duchess consort of Aquitaine | |
| Tenure | c. 1089 - c. 1091 |
| Duchess consort of Brittany | |
| Tenure | 1093 - 1112 |
| Born | c. 1068 Angers |
| Died | 1 June 1146 Jerusalem |
| Burial | Ille-et-Vilaine |
| Spouse | William IX, Duke of Aquitaine Alan IV, Duke of Brittany |
| Issue | Hawise of Brittany Conan III, Duke of Brittany Geoffroy de Bretagne |
| House | House of Anjou |
| Father | Fulk IV, Count of Anjou |
| Mother | Hildegarde of Beaugency |
Ermengarde of Anjou (c. 1068 – 1 June 1146), 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.