| Gladbeck to Obernburg am Main | 152.59 mi (245.58 km) |
| Gladbeck to Obernkirchen | 103.63 mi (166.78 km) |
| Gladbeck to Oberschleissheim | 307.14 mi (494.30 km) |
| Gladbeck to Oberstdorf | 323.34 mi (520.36 km) |
| Gladbeck to Obertraubling | 291.50 mi (469.13 km) |
| Gladbeck to Obertshausen | 131.83 mi (212.15 km) |
| Gladbeck to Oberursel | 117.47 mi (189.05 km) |
| Gladbeck to Ochsenfurt | 189.74 mi (305.36 km) |
| Gladbeck to Ochsenhausen | 275.55 mi (443.46 km) |
| Gladbeck to Ochtrup | 45.16 mi (72.68 km) |
| Gladbeck to Odenthal | 37.42 mi (60.22 km) |
| Gladbeck to Oelde | 53.92 mi (86.77 km) |
| Gladbeck to Oelsnitz | 239.63 mi (385.65 km) |
| Gladbeck to Oer-Erkenschwick | 13.26 mi (21.34 km) |
| Gladbeck to Oerlinghausen | 77.77 mi (125.15 km) |
