Constance of Penthièvre
| Constance of Penthièvre | |
|---|---|
| Viscountess of Rohan | |
| Tenure | Viscountess consort of Rohan |
| Born | 1140 |
| Died | after 1184 |
| Spouse | Alan III, Viscount of Rohan |
| Issue | Alan IV William Josselin Margaret Alix Constance |
| House | Penthièvre |
| Father | Alan of Penthièvre |
| Mother | Bertha, Duchess of Brittany |
Constance of Penthièvre (1140 – after 1184) was a Breton princess, daughter of Alan of Penthièvre, 1st Earl of Richmond, and Bertha of Cornouaille, suo jure Duchess of Brittany.