Oberönz was a municipality in the district of Wangen in the Canton of Bern in Switzerland .

On January 1, 2008, the municipality of Oberönz became part of the municipality of Herzogenbuchsee .

Oberönz is first mentioned in 1246 as Onza.

Oberönz has an area of 3 km2 (1.2 sq mi). Of this area, 48.5% is used for agricultural purposes, while 37.8% is forested. The rest of the land, (13.7%) is settled.