Walliswil bei Wangen is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland.

Walliswil bei Wangen has an area of 3.1 km2 (1.2 sq mi).

Of the rest of the land, 10.1% is settled (buildings or roads) and the remainder (4.2%) is non-productive (rivers, glaciers or mountains).

Most of the population (as of 2000[update]) speaks German (98.7%), with French being second most common ( 0.5%) and Albanian being third ( 0.4%).

In Walliswil bei Wangen about 77.2% of the population (between age 25-64) have completed either non-mandatory upper secondary education or additional higher education (either university or a Fachhochschule).