| Oslo to Octeville | 862.24 mi (1,387.63 km) |
| Oslo to Oignies | 719.37 mi (1,157.71 km) |
| Oslo to Oissel | 824.15 mi (1,326.34 km) |
| Oslo to Olivet | 905.15 mi (1,456.70 km) |
| Oslo to Ollioules | 1,177.11 mi (1,894.37 km) |
| Oslo to Olonne-sur-Mer | 1,055.31 mi (1,698.36 km) |
| Oslo to Oloron-Sainte-Marie | 1,249.71 mi (2,011.21 km) |
| Oslo to Onet Village | 1,126.40 mi (1,812.77 km) |
| Oslo to Onnaing | 715.02 mi (1,150.72 km) |
| Oslo to Orange | 1,117.63 mi (1,798.65 km) |
| Oslo to Orchies | 714.95 mi (1,150.60 km) |
| Oslo to Orleans | 902.51 mi (1,452.45 km) |
| Oslo to Orly | 840.28 mi (1,352.30 km) |
| Oslo to Ormesson-sur-Marne | 835.28 mi (1,344.26 km) |
| Oslo to Orsay | 846.50 mi (1,362.32 km) |
