| Loiano | |
| Official Name: | Comune di Loiano |
| Coordinates: | 44.2667°N 30°W |
| Metropolitan City: | Bologna (BO) |
| Frazioni: | Anconella, Barbarolo, Bibulano, La Guarda, Quinzano, Roncastaldo, Sabbioni, Scanello, Scascoli |
| Mayor: | Fabrizio Morganti |
| Area Total Km2: | 52.41 |
| Population Footnotes: | [1] |
| Population Total: | 4376 |
| Population As Of: | 31 December 2019 |
| Population Demonym: | Loianesi |
| Elevation M: | 714 |
| Postal Code: | 40050 |
| Area Code: | 051 |
Loiano (egl|label=[[Bolognese dialect|Medial Mountain Bolognese]]|Lujèn pronounced as /luˈjɛŋ/; egl|label=[[Bolognese dialect|City Bolognese]]|Lujàn) is a town and comune of Metropolitan City of Bologna in the Emilia-Romagna region of Italy in the Tusco-Emilian Apennines at 714m (2,343feet) above sea level. Highway SS 65 connects it to Bologna, 35km (22miles) to the north, and Florence, 73km (45miles) to the south.
It is the site of the astronomical observatory of the University of Bologna, named after the astronomer Giovanni Domenico Cassini.
At Val Sicura, within the territory of the commune, a shooting range founded in 1889 remains active.