Basse-Allaine (French pronunciation: [bas alɛn]) is a municipality in the district of Porrentruy in the canton of Jura in Switzerland.

On 1 January 2009 the former municipalities of Buix, Courtemaîche and Montignez merged to form Basse-Allaine.

[8] The municipality consists of the villages of Buix, Courtemaîche and Montignez, the hamlet of Le Maira and the land around the Grandgourt priory.

[11] Most of the population (as of 2000[update]) speaks French (93.9%) as their first language, German is the second most common (4.0%) and Spanish is the third (0.9%).

[11] The historical population is given in the following chart:[12] Prairie Dessous on the site of a Gallo-Roman villa and the former priory of Grandgourt are listed as Swiss heritage site of national significance.

The village of Montignez, hamlet of Le Maira and Grandgourt area are all part of the Inventory of Swiss Heritage Sites.

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

[14] During the 2009-10 school year, there were a total of 125 students attending 8 classes in Basse-Allaine.