Flumenthal is a municipality in the district of Lebern in the canton of Solothurn in Switzerland.

The Flumenthal dam was erected in the 1970s on river Aare during the Second Jura water correction in order to regulate the waters of the Seeland's three lakes hydrological system further downstream of the regulating dam Port.

Flumenthal has an area, as of 2009[update], of 3.11 square kilometers (1.20 sq mi).

Of the rest of the land, 0.61 km2 (0.24 sq mi) or 19.6% is settled (buildings or roads), 0.17 km2 (0.066 sq mi) or 5.5% is either rivers or lakes and 0.02 km2 (4.9 acres) or 0.6% is unproductive land.

The blazon of the municipal coat of arms is Gold a Moor's head with Headband and Collar Silver and Lips Gules.

[7] Most of the population (as of 2000[update]) speaks German (956 or 95.0%), with Albanian being second most common (11 or 1.1%) and Italian being third (10 or 1.0%).

At the same time, there was 1 non-Swiss man who immigrated from another country to Switzerland.

[6] The age distribution, as of 2000[update], in Flumenthal is; 77 children or 7.7% of the population are between 0 and 6 years old and 152 teenagers or 15.1% are between 7 and 19.

[7] The historical population is given in the following chart:[12] The Parish Church of St. Peter and Paul is listed as a Swiss heritage site of national significance.

[13] In the 2007 federal election the most popular party was the SVP which received 26.43% of the vote.

In the federal election, a total of 327 votes were cast, and the voter turnout was 41.7%.

[7] There were 585 residents of the municipality who were employed in some capacity, of which females made up 42.7% of the workforce.

In the tertiary sector; 6 or 3.3% were in wholesale or retail sales or the repair of motor vehicles, 5 or 2.7% were in the movement and storage of goods, 34 or 18.6% were in a hotel or restaurant, 3 or 1.6% were in the information industry, 3 or 1.6% were the insurance or financial industry, 10 or 5.5% were technical professionals or scientists, 6 or 3.3% were in education and 113 or 61.7% were in health care.

[7] From the 2000 census[update], 396 or 39.4% were Roman Catholic, while 349 or 34.7% 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 Flumenthal attend their school in a neighboring municipality.