| Gjerdøya | |
| Location: | Nordland, Norway |
| Mapframe-Zoom: | 8 |
| Coordinates: | 66.6136°N 12.9907°W |
| Area Km2: | 9.3 |
| Length Km: | 5 |
| Width Km: | 2.5 |
| Elevation M: | 168 |
| Highest Mount: | Fjellet |
| Country: | Norway |
| Country Admin Divisions Title: | County |
| Country Admin Divisions: | Nordland |
| Country Admin Divisions Title 1: | Municipality |
| Country Admin Divisions 1: | Rødøy Municipality |
| Population: | 87 |
| Population As Of: | 2016 |
Gjerdøya[1] is an island in Rødøy Municipality in Nordland county, Norway. It is located in a group of islands located west of the peninsula between the Tjongsfjorden and Melfjorden. It lies south of the island of Rødøya, north of the island of Rangsundøya, and west of the island of Renga. The main village on the island is called Gjerøy. The 9.3km2 island has a population (2016) of 87 people. There is regular ferry service to Gjerdøya from the mainland and to the islands surrounding it.[2]