| Brussels to Obernburg am Main | 222.28 mi (357.72 km) |
| Brussels to Obernkirchen | 226.94 mi (365.22 km) |
| Brussels to Oberschleissheim | 369.60 mi (594.82 km) |
| Brussels to Oberstdorf | 357.84 mi (575.89 km) |
| Brussels to Obertraubling | 371.00 mi (597.06 km) |
| Brussels to Obertshausen | 204.30 mi (328.80 km) |
| Brussels to Oberursel | 190.78 mi (307.03 km) |
| Brussels to Ochsenfurt | 265.58 mi (427.41 km) |
| Brussels to Ochsenhausen | 315.92 mi (508.43 km) |
| Brussels to Ochtrup | 153.92 mi (247.71 km) |
| Brussels to Odenthal | 121.03 mi (194.78 km) |
| Brussels to Oelde | 177.49 mi (285.65 km) |
| Brussels to Oelsnitz | 343.59 mi (552.95 km) |
| Brussels to Oer-Erkenschwick | 136.87 mi (220.26 km) |
| Brussels to Oerlinghausen | 201.36 mi (324.06 km) |
