Bleienbach is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland.

[3] Evidence of prehistoric settlements near Bleienbach include a Hallstatt grave mound in Oberbützberg, a High Medieval earthen fortress in Eggwald, and an ancient road near the village church.

The low court and right to appoint priests to the village church were originally part of the Herrschaft of Langenstein-Grünenberg.

In 1331 Johann of Aarwangen purchased a half share in the rights to the village.

Of the rest of the land, 0.47 km2 (0.18 sq mi) or 8.3% is settled (buildings or roads), 0.09 km2 (22 acres) or 1.6% is either rivers or lakes.

[6] The blazon of the municipal coat of arms is Impalled Sable in chief a Fish embowed Argent and in base a Trefoil Vert and of the second a Bar of the first.

This may be an example of canting arms since the German word Blei is a name for a type of fish, the Bream.

[10] Most of the population (as of 2000[update]) speaks German (691 or 95.7%) as their first language, Serbo-Croatian is the second most common (6 or 0.8%) and French is the third (5 or 0.7%).

The historical population is given in the following chart:[3][13] The entire village of Bleienbach is designated as part of the Inventory of Swiss Heritage Sites.

In the federal election, a total of 300 votes were cast, and the voter turnout was 55.7%.

In the tertiary sector; 7 or 5.8% were in wholesale or retail sales or the repair of motor vehicles, 2 or 1.7% were in the movement and storage of goods, 16 or 13.3% were in a hotel or restaurant, 47 or 39.2% were technical professionals or scientists, 7 or 5.8% were in education and 35 or 29.2% were in health care.

[10] From the 2000 census[update], 73 or 10.1% were Roman Catholic, while 579 or 80.2% belonged to the Swiss Reformed Church.

This is followed by three years of obligatory lower Secondary school where the students are separated according to ability and aptitude.

Following the lower Secondary students may attend additional schooling or they may enter an apprenticeship.

[18] During the 2009-10 school year, there were a total of 44 students attending classes in Bleienbach.