| Reggio Emilia to Orbetello | 158.86 mi (255.66 km) |
| Reggio Emilia to Oria | 459.00 mi (738.70 km) |
| Reggio Emilia to Oristano | 347.26 mi (558.86 km) |
| Reggio Emilia to Orta Nova | 346.29 mi (557.30 km) |
| Reggio Emilia to Orte | 177.88 mi (286.26 km) |
| Reggio Emilia to Ortona | 248.89 mi (400.56 km) |
| Reggio Emilia to Orvieto | 155.52 mi (250.29 km) |
| Reggio Emilia to Orzinuovi | 59.22 mi (95.30 km) |
| Reggio Emilia to Osimo | 164.51 mi (264.76 km) |
| Reggio Emilia to Ospitaletto | 65.10 mi (104.76 km) |
| Reggio Emilia to Ostuni | 446.48 mi (718.54 km) |
| Reggio Emilia to Ottaviano | 329.72 mi (530.63 km) |
| Reggio Emilia to Ovada | 97.72 mi (157.26 km) |
| Reggio Emilia to Ozieri | 296.13 mi (476.58 km) |
| Reggio Emilia to Paceco | 474.57 mi (763.75 km) |
