| Katherine Percy | |
| Countess of Kent | |
| Spouse: | Edmund Grey, 1st Earl of Kent |
| Issue: | Mary Grey Anthony Grey Elizabeth Grey Anne Grey George Grey, 2nd Earl of Kent John Grey Edmund Grey |
| Father: | Henry Percy, 2nd Earl of Northumberland |
| Mother: | Lady Eleanor Neville |
| Birth Date: | 18 May 1423 |
| Death Date: | 1475 |
Lady Katherine Percy (18 May 1423 –) was the daughter of Henry Percy, 2nd Earl of Northumberland, and Lady Eleanor Neville.
Her maternal grandparents were Ralph Neville, 1st Earl of Westmorland and his second wife Joan Beaufort, a legitimized daughter of John of Gaunt.
She married Edmund Grey, 1st Earl of Kent, and had seven children: