Mosso was a comune (municipality) of the Province of Biella in the Italian region Piedmont, located in the Biellese Prealps about 70 kilometres (43 mi) northeast of Turin and about 9 kilometres (6 mi) northeast of Biella.

It was formed in 1998 by the fusion of the existing communes of Mosso Santa Maria and Pistolesa.

The commune extended over an area of 18.24 square kilometres (7.04 sq mi).

In addition to Mosso Santa Maria and Pistolesa, the commune's statute listed the following frazioni: and the following minor localities: Frazione Sella is known as the birthplace of Quintino Sella, academic, politician and founder of the Club Alpino Italiano.

From 1 January 2019 Mosso was absorbed by the new-born municipality of Valdilana.