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

Oberramsern is first mentioned in 1276 as Rambsern though this comes from a 17th-century copy of the original. In 1318 it was mentioned as Ramserron superiori.

Oberramsern has an area, as of 2009, of 1.75 square kilometers (0.68 sq mi). Of this area, 1.18 km2 (0.46 sq mi) or 67.4% is used for agricultural purposes, while 0.5 km2 (0.19 sq mi) or 28.6% is forested.