Mühledorf is a former municipality in the Bucheggberg District, in the canton of Solothurn, Switzerland.

On 1 January 2014 the former municipalities of Mühledorf (SO), Tscheppach, Brügglen, Aetingen, Aetigkofen, Bibern (SO), Gossliwil, Hessigkofen, Küttigkofen, Kyburg-Buchegg merged into the new municipality of Buchegg.

[4] The former municipality is located in the Bucheggberg district, in the Mühle valley.

The blazon of the municipal coat of arms is Or a Mill-Wheel Sable.

[3] Most of the population (as of 2000[update]) speaks German (321 or 97.9%), with French being second most common (4 or 1.2%) and Italian being third (1 or 0.3%).

[6] The age distribution, as of 2000[update], in Mühledorf is; 30 children or 9.1% of the population are between 0 and 6 years old and 73 teenagers or 22.3% are between 7 and 19.

[3] The historical population is given in the following chart:[2][11] In the 2007 federal election the most popular party was the FDP which received 34.8% of the vote.

In the federal election, a total of 167 votes were cast, and the voter turnout was 59.9%.

[3] There were 173 residents of the municipality who were employed in some capacity, of which females made up 46.2% of the workforce.

The number of jobs in the primary sector was 28, of which 22 were in agriculture and 6 were in forestry or lumber production.

In the tertiary sector; 12 or 29.3% were in wholesale or retail sales or the repair of motor vehicles, 8 or 19.5% were in the movement and storage of goods, 12 or 29.3% were in a hotel or restaurant, 4 or 9.8% were technical professionals or scientists, .

[3] From the 2000 census[update], 38 or 11.6% were Roman Catholic, while 241 or 73.5% belonged to the Swiss Reformed Church.