brügglen is a former municipality in the district of bucheggberg, 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.