Fontenais is a municipality in the district of Porrentruy in the canton of Jura in Switzerland.

It stretches across a small valley to the slopes of the surrounding mountains, where the main village developed.

It consists of the village of Fontenais and the hamlet of Villars-sur-Fontenais as well as scattered farm houses.

Somewhere on the Le Chételat hill, the remains of an 11th-century castle are supposedly buried.

The blazon of the municipal coat of arms is Azure, a Fountain Argent, and on a Chief Or two Mullets [of Six] Gules.

[10] Most of the population (as of 2000[update]) speaks French (1,187 or 95.0%) as their first language, German is the second most common (35 or 2.8%) and Italian is the third (12 or 1.0%).

[10] The historical population is given in the following chart:[4][14] In the 2007 federal election the most popular party was the SPS which received 70.06% of the vote.

[10] There were 593 residents of the municipality who were employed in some capacity, of which females made up 44.7% of the workforce.

The number of jobs in the primary sector was 32, of which 31 were in agriculture and 1 was in forestry or lumber production.

In the tertiary sector; 18 or 32.1% were in wholesale or retail sales or the repair of motor vehicles, 6 or 10.7% were in the movement and storage of goods, 3 or 5.4% were in a hotel or restaurant, 4 or 7.1% were the insurance or financial industry, 2 or 3.6% were technical professionals or scientists, 8 or 14.3% were in education and 3 or 5.4% were in health care.

[10] From the 2000 census[update], 904 or 72.4% were Roman Catholic, while 145 or 11.6% 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.

[18] During the 2009-10 school year, there were a total of 104 students attending 6 classes in Fontenais.