| Groningen to Oberkirch | 330.26 mi (531.50 km) |
| Groningen to Obernburg am Main | 258.18 mi (415.51 km) |
| Groningen to Obernkirchen | 125.28 mi (201.62 km) |
| Groningen to Oberschleissheim | 406.68 mi (654.49 km) |
| Groningen to Oberstdorf | 433.23 mi (697.21 km) |
| Groningen to Obertraubling | 380.98 mi (613.13 km) |
| Groningen to Obertshausen | 238.33 mi (383.55 km) |
| Groningen to Oberursel | 225.27 mi (362.54 km) |
| Groningen to Ochsenfurt | 288.81 mi (464.80 km) |
| Groningen to Ochsenhausen | 384.98 mi (619.57 km) |
| Groningen to Ochtrup | 74.58 mi (120.02 km) |
| Groningen to Odenthal | 152.65 mi (245.67 km) |
| Groningen to Oelde | 116.47 mi (187.44 km) |
| Groningen to Oelsnitz | 307.48 mi (494.84 km) |
| Groningen to Oer-Erkenschwick | 112.54 mi (181.11 km) |
