| Heidelberg to Oestrich-Winkel | 51.48 mi (82.84 km) |
| Heidelberg to Offenburg | 74.65 mi (120.13 km) |
| Heidelberg to Oftersheim | 6.74 mi (10.84 km) |
| Heidelberg to Ohrdruf | 132.23 mi (212.80 km) |
| Heidelberg to Ohringen | 38.33 mi (61.69 km) |
| Heidelberg to Olbernhau | 222.27 mi (357.71 km) |
| Heidelberg to Olching | 145.12 mi (233.55 km) |
| Heidelberg to Oldenburg | 258.44 mi (415.92 km) |
| Heidelberg to Oldenburg in Holstein | 349.80 mi (562.94 km) |
| Heidelberg to Olfen | 169.34 mi (272.52 km) |
| Heidelberg to Olpe | 117.24 mi (188.69 km) |
| Heidelberg to Olsberg | 133.97 mi (215.61 km) |
| Heidelberg to Oranienburg | 302.65 mi (487.07 km) |
| Heidelberg to Ortenberg | 66.61 mi (107.20 km) |
| Heidelberg to Oschatz | 233.16 mi (375.24 km) |
