| Gerenzago | |
| Official Name: | Comune di Gerenzago |
| Coordinates: | 45.2°N 31°W |
| Region: | Lombardy |
| Province: | Province of Pavia (PV) |
| Frazioni: | Galbere, Cascina Mellana, Cascina Castellere |
| Mayor: | Daniele Mandrini |
| Area Total Km2: | 5.41 |
| Population Footnotes: | [1] |
| Population Total: | 1422 |
| Population As Of: | 31 August 2017 |
| Population Demonym: | Gerenzaghesi |
| Elevation M: | 74 |
| Saint: | St. Pudentiana, St. Maurus |
| Day: | 3rd Sunday in May, 15 January |
| Postal Code: | 27010 |
| Area Code: | 0382 |
Gerenzago is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 35 km southeast of Milan and about 15 km east of Pavia.
Gerenzago borders the following municipalities: Copiano, Corteolona e Genzone, Inverno e Monteleone, Magherno, Villanterio. Economy is mostly based on agriculture and craftmanship, in particular related to building activities.