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.
The island is connected to Lurøya by a short bridge.
Onøya sits just west of the mouth of the Sjona fjord.
The highest point on the island is the 197-metre (646 ft) tall mountain Stokksvikfjellet.