Küttigkofen is a former municipality in the Bucheggberg district, in the canton of Solothurn, Switzerland. On 1 January 2014 the former municipalities of Aetigkofen, Aetingen, Bibern, Brügglen, Gossliwil, Hessigkofen, Küttigkofen, Kyburg-Buchegg, Mühledorf and Tscheppach merged to form the new municipality of Buchegg.