Oberösch is a former municipality in the administrative district of Emmental in the canton of Bern in Switzerland.

On 1 January 2016, the former municipalities of Oberösch and Niederösch merged into Ersigen.

In 1423, Burgdorf acquired one half of the low court of Oberösch from Verena von Rohrmoos.

Later, in the 16th century, Burgdorf bought the other half of the court from Thorberg Chapterhouse.

Oberösch and Niederösch form a single school district.

On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Emmental.

[4] The blazon of the municipal coat of arms is Gules an Ash Tree or issuant from the Base wavy of the same.

The ash tree (German: Esche) makes this an example of canting arms.

[7] Most of the population (as of 2000[update]) speaks German (110 or 97.3%) as their first language, Polish is the second most common (2 or 1.8%) and English is the third (1 or 0.9%).

[9] The historical population is given in the following chart:[2][10] The entire hamlet of Oberösch is designated as part of the Inventory of Swiss Heritage Sites.

The number of jobs in the tertiary sector was 1 which was classified as a technical professional or scientist.

[7] From the 2000 census[update], 6 or 5.3% were Roman Catholic, while 99 or 87.6% belonged to the Swiss Reformed Church.