| Country: | England |
| Official Name: | Great Thorness |
| Coordinates: | 50.7311°N -1.3614°W |
| Map Type: | Isle of Wight |
| Civil Parish: | Calbourne, Newtown and Porchfield |
| Unitary England: | Isle of Wight |
| Lieutenancy England: | Isle of Wight |
| Region: | South East England |
| Constituency Westminster: | Isle of Wight |
| Post Town: | NEWPORT |
| Postcode District: | PO30 |
| Postcode Area: | PO |
| Dial Code: | 01983 |
| Os Grid Reference: | SZ452925 |
Great Thorness is a settlement in the civil parish of Calbourne, Newtown and Porchfield, on the Isle of Wight, off the south coast of England.
The hamlet lies near the north-west coast of the island and Thorness Bay. Great Thorness is approximately 4miles north-west of Newport.