| Heidelberg to Novi di Modena | 328.91 mi (529.33 km) |
| Heidelberg to Novi Ligure | 321.82 mi (517.92 km) |
| Heidelberg to Nuoro | 629.47 mi (1,013.03 km) |
| Heidelberg to Occhiobello | 338.41 mi (544.62 km) |
| Heidelberg to Oderzo | 306.61 mi (493.44 km) |
| Heidelberg to Oggiono | 252.77 mi (406.79 km) |
| Heidelberg to Olbia | 588.52 mi (947.13 km) |
| Heidelberg to Oleggio | 263.74 mi (424.44 km) |
| Heidelberg to Olgiate Comasco | 251.31 mi (404.45 km) |
| Heidelberg to Olgiate Olona | 261.52 mi (420.88 km) |
| Heidelberg to Omegna | 244.92 mi (394.16 km) |
| Heidelberg to Opera | 279.66 mi (450.07 km) |
| Heidelberg to Oppeano | 306.93 mi (493.95 km) |
| Heidelberg to Orbassano | 309.64 mi (498.32 km) |
| Heidelberg to Orbetello | 496.71 mi (799.37 km) |
