| Groningen to Noventa Vicentina | 591.79 mi (952.40 km) |
| Groningen to Novi di Modena | 607.36 mi (977.45 km) |
| Groningen to Novi Ligure | 592.88 mi (954.14 km) |
| Groningen to Nuoro | 900.69 mi (1,449.52 km) |
| Groningen to Occhiobello | 616.07 mi (991.47 km) |
| Groningen to Oderzo | 578.04 mi (930.27 km) |
| Groningen to Oggiono | 528.46 mi (850.47 km) |
| Groningen to Olbia | 860.80 mi (1,385.32 km) |
| Groningen to Oleggio | 534.34 mi (859.94 km) |
| Groningen to Olgiate Comasco | 524.69 mi (844.40 km) |
| Groningen to Olgiate Olona | 534.13 mi (859.60 km) |
| Groningen to Omegna | 513.67 mi (826.67 km) |
| Groningen to Opera | 554.15 mi (891.81 km) |
| Groningen to Oppeano | 584.96 mi (941.40 km) |
| Groningen to Orbassano | 568.89 mi (915.55 km) |
