|Elevation||262.8 m (862 ft)|
|Age of rock||Paleoproterozoic|
|Mountain type||Granite horst|
Omberg (Swedish pronunciation: [ˈɔ̌mːbærj]) is a forested mountain in the western Östergötland County in Sweden. Administratively it is split between the municipalities of Ödeshög in the south and Vadstena in the north. It lies between Lake Vättern and Lake Tåkern. Geologically the mountain is a horst. Alvastra Abbey lies at its foot.
The western cliff of Omberg has been indicated as an ättestupa in folk history.