| Onøya | |
| Location: | Nordland, Norway |
| Mapframe-Zoom: | 8 |
| Coordinates: | 66.387°N 12.8539°W |
| Area Km2: | 7.7 |
| Length Km: | 4.2 |
| Width Km: | 3.8 |
| Elevation M: | 197 |
| Highest Mount: | Stokksvikfjellet |
| Country: | Norway |
| Country Admin Divisions Title: | County |
| Country Admin Divisions: | Nordland |
| Country Admin Divisions Title 1: | Municipality |
| Country Admin Divisions 1: | Lurøy Municipality |
| Population: | 279 |
| Population As Of: | 2017 |
Onøya[1] is an island in Lurøy Municipality in Nordland county, Norway. The administrative centre of Lurøy Municipality is located on the northwestern coast of the island.[2]
The 7.7km2 island lies immediately south of the island of Lurøya and southwest of the island of Stigen. The island is connected to Lurøya by a short bridge. Onøya sits just west of the mouth of the Sjona fjord. It is only accessible by boat. The highest point on the island is the 197m (646feet) tall mountain Stokksvikfjellet. In 2017, there were 279 residents of the island.[3]