Moutier (French pronunciation: [mutje]) is a municipality in Switzerland. Currently, the town belongs to the Jura bernois administrative district of the canton of Bern. On 28 March 2021, the population voted to secede from the canton of Bern and join the Canton of Jura; the decision however is not immediately operative and entails a lengthy process of transfer of competences between cantonal authorities. It is currently the largest town in Jura bernois.

Moutier is first mentioned in 1154 in the phrase datum Monasterii. In 1181, it was mentioned as apud Monasterium ('at the Abbey'). The German name for the town is Münster (BE), but it is not frequently used.

The area was lightly settled even before the founding of Moutier-Grandval Abbey around 640. Much of the early history of the village is closely connected with the Abbey. Between 1049 and 1150, the Abbey was granted a stift or land donation to support the college of canons. The stift allowed the Abbey to grow into a major landholder and a regional power. The village church of Saint-Pierre, which eventually became a parish church, was probably built during the Early Middle Ages. In the 12th century, another monastery was founded in Moutier, but it was destroyed in a fire in 1269. In addition to the Church of Saint-Pierre, the collegiate church of Saint-Germain and Saint-Randoald was built in Moutier during the 12th century. Everything changed in Moutier after the Protestant Reformation was accepted by Bern in 1531. The Abbey closed and the college of canons relocated to Delémont. The church of Saint-Germain and Saint-Randoald was closed while the church of Saint-Pierre converted to the new faith and was expanded. A fire destroyed the church of Saint-Germain and Saint-Randoald in 1571 though in 1860–63 a Reformed church was built on the site. The church of Saint-Pierre was demolished in 1873. Today Moutier has both German and French speaking churches.

After the college of canons of the Abbey moved to Delémont, the Abbey's properties in and around Moutier fell under the Prince-Bishop of Basel. The Bishop appointed a provost to manage the Abbey's estates and around the end of the 16th century, built the Provost's Castle. The provost remained in Moutier until 1797. After the 1797 French victory and the Treaty of Campo Formio, Moutier became part of the French Département of Mont-Terrible. Three years later, in 1800, it became part of the Département of Haut-Rhin. After Napoleon's defeat and the Congress of Vienna, Moutier was assigned to the Canton of Bern in 1815. Two years later, in 1817, the Canton of Bern acquired the castle and used it as the seat of the district governor.

During the 19th century and early 20th century, Moutier developed into a transportation hub. In 1876, a railway opened between Basel and Moutier. This first railroad was followed by a route to Biel through the Tavannes valley in 1877 and then to Solothurn in 1908. In 1915, the 8.6 kilometers (5.3 mi) long Grenchenberg tunnel connected Moutier and Grenchen. The extensive road and railroad network encouraged Moutier to industrialize, with three industries, glass-making, watchmaking, and automatic lathes, gaining international recognition for Moutier.

In 1842, Célestin Châtelain founded the Verrerie de Moutier glass factory. They became the most important window glass manufacturer in Switzerland and by the 1970s produced 250 tons of glass per month to meet Swiss domestic demand. The conversion from glass rolling to float glass spelled the end of the old Moutier glass factory, it closed in 1978. However, a subsidiary, Verres Industriels SA, had been created in 1955 and they began producing glass with the new process. Today, Verres Industriels employs about 200 people.

Watchmaking first spread throughout the Jura region as a cottage industry during the 19th century. In the late 19th century, the Grande Fabrique was built in Moutier and by 1880 employed about 500 workers. A number of watchmakers opened factories in the town, of which Léon Lévy & Frères and Louis Schwab were some of the largest. However, many of Moutier's independent watchmakers went bankrupt and were forced to close during the Great Depression. Those that survived this period were generally absorbed by ETA SA in the 1950s.

In 1883, Nicolas Junker founded the Junker & Cie company to manufacture automatic lathes with a moveable headstock. After a bankruptcy and several name changes the company became Usines Tornos, Fabrique de machines Moutier SA in 1918. In 1968, Tornos bought the Pétermann SA company to become Tornos Pétermann. They then merged in 1974 with Bechler SA to become Moutier Machines Holding, which became Tornos-Bechler SA in 1981. It was renamed to Tornos SA in 2001. Over its nearly a century in operation, Usines Tornos built workers' housing, provided jobs and vocational training and helped drive Moutier's growth. At its peak in 1974, the company employed about 3,000 people. Between 1980 and 2000, the company acquired and sold off several companies and reduced its headcount to about 1300 in 2001. In 2010, the company employed 855 people, including 655 in Moutier.