| Castel Guelfo di Bologna | |
| Official Name: | Comune di Castel Guelfo di Bologna |
| Coordinates: | 44.4333°N 52°W |
| Region: | Emilia-Romagna |
| Metropolitan City: | Bologna (BO) |
| Frazioni: | Poggio Piccolo, Via Larga |
| Mayor: | Cristina Carpeggiani |
| Area Total Km2: | 28.6 |
| Population Total: | 4489 |
| Population As Of: | 31 December 2014 [1] |
| Population Demonym: | Guelfesi |
| Elevation M: | 32 |
| Postal Code: | 40023 |
| Area Code: | 0542 |
Castel Guelfo di Bologna (Eastern Bolognese: Castèl Guêlf or Castelghèif) is a comune (municipality) in the Metropolitan City of Bologna in the Italian region Emilia-Romagna, located about 30km (20miles) southeast of Bologna.
Castel Guelfo di Bologna borders the following municipalities: Castel San Pietro Terme, Dozza, Imola, Medicina.