Omberg (Swedish pronunciation: [ˈɔ̌mːbærj])[1] is a forested mountain in western Östergötland County in Sweden.

Administratively it is split between the municipalities of Ödeshög in the south and Vadstena in the north.

Geologically Omberg is a horst, a fault-bounded and uplifted block of bedrock.

[2] The western cliff of Omberg has been indicated as an ättestupa in folk history.

This article about a location in Östergötland County, Sweden is a stub.