is a town in the Province of Pavia
, region of Lombardy
), with a population of 5,914 (2005).
It is 12 km east of the city of Pavia, between the Olona River and the Po River. Due to its geographical location Belgioioso has become one of the southern suburbs of the city of Milan.
Belgioioso is particularly noted for its medieval castle, the seat of the Belgiojoso family. Francis I of France was held there after the Battle of Pavia.