| Henley on Thames to Oerlinghausen | 410.12 mi (660.02 km) |
| Henley on Thames to Oestrich-Winkel | 402.97 mi (648.52 km) |
| Henley on Thames to Offenburg | 445.64 mi (717.18 km) |
| Henley on Thames to Oftersheim | 442.99 mi (712.92 km) |
| Henley on Thames to Ohrdruf | 505.78 mi (813.98 km) |
| Henley on Thames to Ohringen | 485.54 mi (781.40 km) |
| Henley on Thames to Olbernhau | 619.59 mi (997.13 km) |
| Henley on Thames to Olching | 590.06 mi (949.61 km) |
| Henley on Thames to Oldenburg | 400.27 mi (644.17 km) |
| Henley on Thames to Oldenburg in Holstein | 526.07 mi (846.63 km) |
| Henley on Thames to Olfen | 355.45 mi (572.04 km) |
| Henley on Thames to Olpe | 379.07 mi (610.06 km) |
| Henley on Thames to Olsberg | 404.15 mi (650.42 km) |
| Henley on Thames to Oranienburg | 604.41 mi (972.70 km) |
| Henley on Thames to Ortenberg | 440.74 mi (709.31 km) |
