Kyburg-Buchegg is a former municipality in the district of Bucheggberg, in the canton of Solothurn, Switzerland.

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

Of the rest of the land, 0.2 km2 (0.077 sq mi) or 12.5% is settled (buildings or roads), 0.03 km2 (7.4 acres) or 1.9% is either rivers or lakes.

Kyburg is the easternmost municipality on the northern edge of the Limpach valley.

The blazon of the municipal coat of arms is Gules Tower of "Bucheggschloss" Argent on a Mount Vert.

[3] Most of the population (as of 2000[update]) speaks German (327 or 98.2%), with French being second most common (2 or 0.6%) and Romansh being third (1 or 0.3%).

[6] The age distribution, as of 2000[update], in Kyburg-Buchegg is; 29 children or 8.7% of the population are between 0 and 6 years old and 68 teenagers or 20.4% 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 SVP which received 29.57% of the vote.

In the federal election, a total of 165 votes were cast, and the voter turnout was 63.0%.

[3] There were 173 residents of the municipality who were employed in some capacity, of which females made up 44.5% of the workforce.

The number of jobs in the secondary sector was 11 of which 5 or (45.5%) were in manufacturing and 7 (63.6%) were in construction.

In the tertiary sector; 10 or 7.9% were in a hotel or restaurant, 4 or 3.1% were in the information industry, 6 or 4.7% were in education and 108 or 85.0% were in health care.

[3] From the 2000 census[update], 47 or 14.1% were Roman Catholic, while 207 or 62.2% belonged to the Swiss Reformed Church.