| Gladbeck to Octeville | 400.40 mi (644.38 km) |
| Gladbeck to Oignies | 188.57 mi (303.48 km) |
| Gladbeck to Oissel | 300.59 mi (483.75 km) |
| Gladbeck to Olivet | 341.42 mi (549.46 km) |
| Gladbeck to Ollioules | 584.61 mi (940.83 km) |
| Gladbeck to Olonne-sur-Mer | 526.07 mi (846.63 km) |
| Gladbeck to Oloron-Sainte-Marie | 677.55 mi (1,090.41 km) |
| Gladbeck to Onet Village | 536.86 mi (863.99 km) |
| Gladbeck to Onnaing | 167.64 mi (269.79 km) |
| Gladbeck to Orange | 522.84 mi (841.43 km) |
| Gladbeck to Orchies | 178.49 mi (287.25 km) |
| Gladbeck to Orleans | 339.12 mi (545.76 km) |
| Gladbeck to Orly | 281.04 mi (452.28 km) |
| Gladbeck to Ormesson-sur-Marne | 274.34 mi (441.51 km) |
| Gladbeck to Orsay | 289.87 mi (466.50 km) |
