Lüterswil-Gächliwil is a former municipality in the district of Bucheggberg, in the canton of Solothurn, Switzerland.

It was formed in 1994 from the merger of the two previously independent municipalities of Lüterswil and Gächliwil.

Lüterswil is first mentioned in 1276 as zu Lüterswyl though this comes from a 17th-century copy of the original document.

[4] Lüterswil-Gächliwil has an area, as of 2009[update], of 3.05 square kilometers (1.18 sq mi).

Of the rest of the land, 0.19 km2 (0.073 sq mi) or 6.2% is settled (buildings or roads).

[6] The blazon of the municipal coat of arms is Per fess Gules a Rock Argent between two Beech Trees Vert and Azure a Semi Horse rampant Argent.

[10] Most of the population (as of 2000[update]) speaks German (366 or 98.7%), with French being second most common (3 or 0.8%) and Italian being third (1 or 0.3%).

[11] As of 2008[update], the gender distribution of the population was 50.9% male and 49.1% female.

[9] The age distribution, as of 2000[update], in Lüterswil-Gächliwil is; 28 children or 7.5% of the population are between 0 and 6 years old and 56 teenagers or 15.1% are between 7 and 19.

[10] The historical population is given in the following chart:[15][16] In the 2007 federal election the most popular party was the FDP which received 30.8% of the vote.

In the federal election, a total of 162 votes were cast, and the voter turnout was 61.1%.

[10] There were 180 residents of the municipality who were employed in some capacity, of which females made up 41.7% of the workforce.

In the tertiary sector; 6 or 7.5% were in wholesale or retail sales or the repair of motor vehicles, 3 or 3.8% were in a hotel or restaurant, 20 or 25.0% were the insurance or financial industry, 5 or 6.3% were technical professionals or scientists, and 47 or 58.8% were in health care.

[10] From the 2000 census[update], 39 or 10.5% were Roman Catholic, while 305 or 82.2% belonged to the Swiss Reformed Church.