| Groningen to Oerlinghausen | 123.39 mi (198.58 km) |
| Groningen to Oestrich-Winkel | 230.59 mi (371.10 km) |
| Groningen to Offenburg | 333.55 mi (536.79 km) |
| Groningen to Oftersheim | 279.65 mi (450.05 km) |
| Groningen to Ohrdruf | 242.03 mi (389.50 km) |
| Groningen to Ohringen | 305.13 mi (491.06 km) |
| Groningen to Olbernhau | 337.59 mi (543.30 km) |
| Groningen to Olching | 403.95 mi (650.09 km) |
| Groningen to Oldenburg | 68.39 mi (110.06 km) |
| Groningen to Oldenburg in Holstein | 191.51 mi (308.21 km) |
| Groningen to Olfen | 109.19 mi (175.72 km) |
| Groningen to Olpe | 161.22 mi (259.46 km) |
| Groningen to Olsberg | 152.30 mi (245.10 km) |
| Groningen to Oranienburg | 279.18 mi (449.29 km) |
| Groningen to Ortenberg | 224.44 mi (361.20 km) |
