| Elia Island | |
| Map: | Guinea-Bissau |
| Location: | Cacheu River |
| Length Km: | 10.5 |
| Width Km: | 4.2 |
| Elevation M: | 5 |
| Country: | Guinea-Bissau |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | Cacheu Region |
| Country Admin Divisions Title 1: | Sector |
| Country Admin Divisions 1: | São Domingos |
Elia Island (Portuguese: Ilha de Elia) is an island in Guinea-Bissau. It is located on the right bank of the Cacheu River close to its mouth in the Atlantic Ocean. The islands's western end lies east of the confluence with the Elia River with Ongueringao Island on the other bank.[1] Its maximum elevation is 5 m and its length 10.5 km[2]