| Gragnano Trebbiense | |
| Official Name: | Comune di Gragnano Trebbiense |
| Coordinates: | 45.0167°N 43°W |
| Region: | Emilia-Romagna |
| Province: | Piacenza (PC) |
| Frazioni: | Campremoldo Sopra, Campremoldo Sotto, Casaliggio, Gragnanino |
| Mayor: | Andrea Barocelli |
| Area Total Km2: | 34.6 |
| Population Footnotes: | [1] |
| Population Total: | 4147 |
| Population As Of: | 31 May 2007 |
| Population Demonym: | Gragnanesi |
| Elevation M: | 82 |
| Postal Code: | 29010 |
| Area Code: | 0523 |
Gragnano Trebbiense (Piacentino: Gragnàn) is a comune (municipality) in the Province of Piacenza in the Italian region, Emilia-Romagna, located about 150km (90miles) northwest of Bologna and about 11km (07miles) southwest of Piacenza.
The battle of the Trebia was fought in Gragnano's territory in 218 BC.