| Roskilde to Oestrich-Winkel | 425.80 mi (685.25 km) |
| Roskilde to Offenburg | 526.46 mi (847.26 km) |
| Roskilde to Oftersheim | 457.98 mi (737.05 km) |
| Roskilde to Ohrdruf | 337.79 mi (543.62 km) |
| Roskilde to Ohringen | 458.67 mi (738.15 km) |
| Roskilde to Olbernhau | 348.17 mi (560.33 km) |
| Roskilde to Olching | 515.77 mi (830.05 km) |
| Roskilde to Oldenburg | 232.75 mi (374.58 km) |
| Roskilde to Oldenburg in Holstein | 104.71 mi (168.51 km) |
| Roskilde to Olfen | 332.77 mi (535.54 km) |
| Roskilde to Olpe | 364.85 mi (587.17 km) |
| Roskilde to Olsberg | 331.80 mi (533.97 km) |
| Roskilde to Oranienburg | 205.42 mi (330.59 km) |
| Roskilde to Ortenberg | 386.76 mi (622.43 km) |
| Roskilde to Oschatz | 303.46 mi (488.37 km) |
