| Harelbeke to Oestrich-Winkel | 214.58 mi (345.33 km) |
| Harelbeke to Offenburg | 264.43 mi (425.55 km) |
| Harelbeke to Oftersheim | 255.07 mi (410.49 km) |
| Harelbeke to Ohrdruf | 323.59 mi (520.76 km) |
| Harelbeke to Ohringen | 297.40 mi (478.61 km) |
| Harelbeke to Olbernhau | 437.79 mi (704.56 km) |
| Harelbeke to Olching | 402.85 mi (648.32 km) |
| Harelbeke to Oldenburg | 261.50 mi (420.84 km) |
| Harelbeke to Oldenburg in Holstein | 396.67 mi (638.38 km) |
| Harelbeke to Olfen | 185.62 mi (298.73 km) |
| Harelbeke to Olpe | 197.09 mi (317.19 km) |
| Harelbeke to Olsberg | 226.83 mi (365.05 km) |
| Harelbeke to Oranienburg | 443.36 mi (713.52 km) |
| Harelbeke to Ortenberg | 254.09 mi (408.93 km) |
| Harelbeke to Oschatz | 425.93 mi (685.47 km) |
