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