Messen is a municipality in the district of Bucheggberg, in the Canton of Solothurn , Switzerland . On 1 January 2010 the municipalities of Balm bei Messen , Brunnenthal and Oberramsern merged into the municipality of Messen.

Messen is first mentioned in 1223 as Messon. Balm bei Messen is first mentioned in 1254 as de Balmo. In 1275 it was mentioned as in Balm. Brunnenthal is first mentioned in 1387 as Wernher von Brunnental.