Metzerlen-Mariastein is a municipality in the district of Dorneck in the canton of Solothurn in Switzerland.

The nearby Benedictine Mariastein Abbey is an important place of pilgrimage.

[3] Metzerlen-Mariastein has an area, as of 2009[update], of 8.49 square kilometers (3.28 sq mi).

Of the rest of the land, 0.65 km2 (0.25 sq mi) or 7.7% is settled (buildings or roads), 0.01 km2 (2.5 acres) or 0.1% is either rivers or lakes.

[4] The municipality is located in the Dorneck district, at the north foot of the Blauen mountain in the upper Birsig and Leimen valleys.

It consists of the S-shaped linear village of Metzerlen and the hamlets of Mariastein around the monastery.

[8] Most of the population (as of 2000[update]) speaks German (789 or 96.6%), with English being second most common (6 or 0.7%) and French being third (5 or 0.6%).

[8] The historical population is given in the following chart:[3][11] The Benedictine Mariastein Abbey with its library is listed as a Swiss heritage site of national significance.

[12] In the 2007 federal election the most popular party was the CVP which received 28.12% of the vote.

In the federal election, a total of 344 votes were cast, and the voter turnout was 49.7%.

[8] There were 448 residents of the municipality who were employed in some capacity, of which females made up 42.9% of the workforce.

In the tertiary sector; 32 or 22.4% were in wholesale or retail sales or the repair of motor vehicles, 4 or 2.8% were in the movement and storage of goods, 45 or 31.5% were in a hotel or restaurant, 4 or 2.8% were in the information industry, 7 or 4.9% were technical professionals or scientists, 4 or 2.8% were in education and 3 or 2.1% were in health care.

[8] From the 2000 census[update], 541 or 66.2% were Roman Catholic, while 103 or 12.6% belonged to the Swiss Reformed Church.

The education system in the Canton of Solothurn allows young children to attend two years of non-obligatory Kindergarten.

All the lower secondary students from Metzerlen-Mariastein attend their school in a neighboring municipality.