Schlosswil is a former municipality in the Bern-Mittelland administrative district in the Canton of Bern in Switzerland . On 1 January 2018 the former municipality of Schlosswil merged into the municipality of Grosshöchstetten .

Schlosswil is first mentioned in 1146 as Wilare. Until 1902 it was known as Wyl.

The earliest trace of a settlement in the area include scattered Bronze Age artifacts as well as carved granite block of indeterminate age. A few Roman era artifacts have also been found near the Schlossallee street.