Ona is a village and an island group located in Ålesund Municipality in Møre og Romsdal county, Norway.

On 30 January 2025, the Norwegian County Governor announced his administration had greenlit a local authority swap for the islands of Ona and Sandøy.

Ironically, the decision rescinds Paul Knudsen Gaasø's 1860 quest to gain local independence for the islands of Sandøy, Ona, Orten and Harøy from Aukra.

Ona was featured, along with "Morning Song" by Babe Rainbow, in the Allstate Insurance Company's (U.S.) television commercial in 2020.

[3][4] Ona has an oceanic climate (Köppen: Cfb) with cool/mild summers and chilly winters with lots of rainfall.