| Duisburg to Oestrich-Winkel | 112.94 mi (181.76 km) |
| Duisburg to Offenburg | 211.56 mi (340.48 km) |
| Duisburg to Oftersheim | 163.63 mi (263.34 km) |
| Duisburg to Ohrdruf | 177.15 mi (285.10 km) |
| Duisburg to Ohringen | 196.00 mi (315.43 km) |
| Duisburg to Olbernhau | 290.18 mi (467.01 km) |
| Duisburg to Olching | 301.83 mi (485.75 km) |
| Duisburg to Oldenburg | 133.07 mi (214.15 km) |
| Duisburg to Oldenburg in Holstein | 262.08 mi (421.78 km) |
| Duisburg to Olfen | 33.02 mi (53.14 km) |
| Duisburg to Olpe | 54.60 mi (87.87 km) |
| Duisburg to Olsberg | 74.42 mi (119.76 km) |
| Duisburg to Oranienburg | 289.44 mi (465.80 km) |
| Duisburg to Ortenberg | 124.65 mi (200.61 km) |
| Duisburg to Oschatz | 273.76 mi (440.57 km) |
