| Gravelines to Novi di Modena | 584.15 mi (940.10 km) |
| Gravelines to Novi Ligure | 529.00 mi (851.35 km) |
| Gravelines to Nuoro | 814.28 mi (1,310.46 km) |
| Gravelines to Occhiobello | 604.88 mi (973.46 km) |
| Gravelines to Oderzo | 595.40 mi (958.21 km) |
| Gravelines to Oggiono | 488.50 mi (786.16 km) |
| Gravelines to Olbia | 779.77 mi (1,254.92 km) |
| Gravelines to Oleggio | 477.05 mi (767.74 km) |
| Gravelines to Olgiate Comasco | 476.80 mi (767.33 km) |
| Gravelines to Olgiate Olona | 482.48 mi (776.47 km) |
| Gravelines to Omegna | 455.12 mi (732.44 km) |
| Gravelines to Opera | 506.01 mi (814.35 km) |
| Gravelines to Oppeano | 572.54 mi (921.41 km) |
| Gravelines to Orbassano | 482.62 mi (776.71 km) |
| Gravelines to Orbetello | 729.56 mi (1,174.12 km) |
