Bollengo's name derives from 'boléngh', meaning small pond, a term coined by the fact that the town was built on what was once a lagoon.
The first documents mentioning the 'Curte Belenci' date back to 917, while subsequent documents date back to 1041, the year the monastery was founded, and 1100, when the free castle was built to contain Vercelli's expansionist policy toward Ivrea. It was later expanded into the current castle by the Bonaventura family of Turin in 1708.

The town was divided into the districts of Paerno and Pessano, of which only a few significant remains remain: of the former, an imposing and evocative bell tower standing alone on a plateau overlooking the Serra woods; the bell tower nicknamed Ciucarun or Ciuchè, belonging to the Romanesque church of San Martino, which was demolished in the 18th century by episcopal decree due to its poor condition. Of the latter, the church of Saints Peter and Paul, also Romanesque, with its bell tower.

Bollengo today!

While maintaining and safeguarding its agricultural characteristics, which make it a town where one can still live peacefully, Bollengo has seen significant development in recent years in terms of primary and secondary urbanization, services, and social, recreational, and cultural initiatives.