San Genesio ed Uniti is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 25 km south of Milan and about 11 km northeast of Pavia.

[3] San Genesio ed Uniti borders the following municipalities: Borgarello, Bornasco, Giussago, Pavia, Sant'Alessio con Vialone, Zeccone.

Under Gian Galeazzo Visconti the territory of San Genesio was included in the vast Visconti Park, extending between the castle of Pavia and the Certosa and included in a wall delimiting its perimeter.

following the fall of the Sforza the park was neglected and decayed, although its area was still identified as administrative district (Parco Nuovo).

In the territory of San Genesio was fought the Battle of Pavia of 1525 between the kingdom of France and the Holy Roman Empire.