Mary of Waltham
| Mary of Waltham | |
|---|---|
Mary of Waltham, relief sculpture, detail from monument to Edward III in Westminster Abbey | |
| Duchess consort of Brittany | |
| Tenure | 1361–1362 |
| Born | 10 October 1344 Waltham, Hampshire, England |
| Died | September 1361 (aged 16) |
| Burial | Abingdon Abbey, Berkshire, England |
| Spouse | |
| House | Plantagenet |
| Father | Edward III of England |
| Mother | Philippa of Hainault |
Mary of Waltham (10 October 1344 – September 1361), Duchess of Brittany, was a daughter of King Edward III of England and Philippa of Hainault and was the wife of John IV, Duke of Brittany, known in England as "John V" and "The Conqueror". Mary was made a Lady of the Garter in 1378.