| Bologna to Oberkirch | 319.17 mi (513.65 km) |
| Bologna to Obernburg am Main | 383.54 mi (617.24 km) |
| Bologna to Obernkirchen | 546.58 mi (879.63 km) |
| Bologna to Oberschleissheim | 259.74 mi (418.01 km) |
| Bologna to Oberstdorf | 207.83 mi (334.48 km) |
| Bologna to Obertraubling | 311.43 mi (501.20 km) |
| Bologna to Obertshausen | 402.55 mi (647.84 km) |
| Bologna to Oberursel | 415.11 mi (668.05 km) |
| Bologna to Ochsenfurt | 361.26 mi (581.40 km) |
| Bologna to Ochsenhausen | 256.04 mi (412.05 km) |
| Bologna to Ochtrup | 565.68 mi (910.37 km) |
| Bologna to Odenthal | 492.41 mi (792.46 km) |
| Bologna to Oelde | 527.88 mi (849.55 km) |
| Bologna to Oelsnitz | 411.02 mi (661.48 km) |
| Bologna to Oer-Erkenschwick | 528.59 mi (850.68 km) |
