Gossliwil is a former municipality in the district of Bucheggberg, in the canton of Solothurn, Switzerland.

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

[2] Before the merger, Gossliwil had a total area of 2.0 km2 (0.77 sq mi).

Of the rest of the land, 0.15 km2 (37 acres) or 7.7% is settled (buildings or roads).

[4] The former municipality is located in the Bucheggberg district, on a plateau near the source of the Biberenbach river.

The blazon of the municipal coat of arms is Gules a Garb Or issuant from a Mount of 3 Coupeaux Vert surrounded with three Cinquefoils of the second, one and two.

[3] Most of the population (as of 2000[update]) speaks German (183 or 97.3%), with Albanian being second most common (4 or 2.1%) and Portuguese being third (1 or 0.5%).

[6] The age distribution, as of 2000[update], in Gossliwil is; 22 children or 11.7% of the population are between 0 and 6 years old and 25 teenagers or 13.3% 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 SVP which received 37.3% of the vote.

In the federal election, a total of 73 votes were cast, and the voter turnout was 49.3%.

[3] There were 97 residents of the municipality who were employed in some capacity, of which females made up 42.3% of the workforce.

[3] From the 2000 census[update], 19 or 10.1% were Roman Catholic, while 133 or 70.7% belonged to the Swiss Reformed Church.