| Grosseto to Novi di Modena | 147.27 mi (237.02 km) |
| Grosseto to Novi Ligure | 179.68 mi (289.16 km) |
| Grosseto to Nuoro | 192.35 mi (309.56 km) |
| Grosseto to Occhiobello | 150.81 mi (242.70 km) |
| Grosseto to Oderzo | 219.35 mi (353.01 km) |
| Grosseto to Oggiono | 225.68 mi (363.19 km) |
| Grosseto to Olbia | 152.05 mi (244.70 km) |
| Grosseto to Oleggio | 230.75 mi (371.36 km) |
| Grosseto to Olgiate Comasco | 233.60 mi (375.94 km) |
| Grosseto to Olgiate Olona | 226.44 mi (364.42 km) |
| Grosseto to Omegna | 252.82 mi (406.87 km) |
| Grosseto to Opera | 203.51 mi (327.52 km) |
| Grosseto to Oppeano | 175.08 mi (281.77 km) |
| Grosseto to Orbassano | 235.43 mi (378.89 km) |
| Grosseto to Orbetello | 23.33 mi (37.54 km) |
