| Static Image: | Trewithian - geograph.org.uk - 478631.jpg |
| Static Image Width: | 240px |
| Static Image Caption: | Trewithian |
| Country: | England |
| Region: | South West England |
| Map Type: | Cornwall |
| Official Name: | Trewithian |
| Cornish Name: | Trewydhyan |
| Unitary England: | Cornwall |
| Lieutenancy England: | Cornwall |
| Os Grid Reference: | SW878372 |
| Coordinates: | 50.197°N -4.975°W |
| Hide Services: | yes |
Trewithian (Cornish: Trewydhyan)[1] is a hamlet near Portscatho in Cornwall, England.
Trewithian lies within the Cornwall Area of Outstanding Natural Beauty (AONB).