| San Possidonio | |
| Official Name: | Comune di San Possidonio |
| Coordinates: | 44.8833°N 13°W |
| Region: | Emilia-Romagna |
| Province: | Modena (MO) |
| Mayor: | Rudi Accorsi |
| Area Total Km2: | 17.06 |
| Population Footnotes: | [1] |
| Population Total: | 3566 |
| Population As Of: | 31 July 2015 |
| Population Demonym: | Possidiesi |
| Elevation M: | 20 |
| Postal Code: | 41039 |
| Area Code: | 0535 |
San Possidonio (Mirandolese: San Pusidònî) is a comune (municipality) in the Province of Modena in the Italian region Emilia-Romagna, located about 50km (30miles) northwest of Bologna and about 35km (22miles) northeast of Modena.
San Possidonio borders the following municipalities: Cavezzo, Concordia sulla Secchia, Mirandola, Novi di Modena.
San Possidonio is twinned with:
Vinay, Isère, France, since 2013