| Lady Mary Keyes | |
|---|---|
 | |
| Born | 20 April 1545 |
| Died | 20 April 1578 (aged 33) |
| Spouse | Thomas Keyes |
| Father | Henry Grey, 1st Duke of Suffolk |
| Mother | Lady Frances Brandon |
Lady Mary Keyes (née Grey; 20 April 1545[1] – 20 April 1578) was the youngest daughter of Henry Grey, 1st Duke of Suffolk, and Frances Brandon, and through her mother had a claim on the crown of England.