John Grey | |
|---|---|
| Earl of Tankerville Lord of Powys, jure uxoris | |
 Arms of Sir John Grey, 1st Earl of Tankerville, KG | |
| Born | after 1384 |
| Died | 22 March 1421 |
| Spouse(s) | Joan de Cherleton |
| Issue | Henry Grey, 2nd Earl of Tankerville |
| Father | Sir Thomas Grey |
| Mother | Joan Mowbray |
John Grey, 1st Earl of Tankerville jure uxoris 6th Lord of Powys (after 1384 – 22 March 1421), KG, was an English peer who served with distinction in the Hundred Years' War between England and France under King Henry V.