| Giesen to Oestrich-Winkel | 172.56 mi (277.71 km) |
| Giesen to Offenburg | 271.88 mi (437.55 km) |
| Giesen to Oftersheim | 203.55 mi (327.58 km) |
| Giesen to Ohrdruf | 101.58 mi (163.48 km) |
| Giesen to Ohringen | 207.96 mi (334.67 km) |
| Giesen to Olbernhau | 182.47 mi (293.66 km) |
| Giesen to Olching | 283.54 mi (456.31 km) |
| Giesen to Oldenburg | 95.63 mi (153.89 km) |
| Giesen to Oldenburg in Holstein | 150.87 mi (242.80 km) |
| Giesen to Olfen | 111.55 mi (179.53 km) |
| Giesen to Olpe | 120.08 mi (193.26 km) |
| Giesen to Olsberg | 83.85 mi (134.94 km) |
| Giesen to Oranienburg | 146.22 mi (235.32 km) |
| Giesen to Ortenberg | 132.35 mi (213.00 km) |
| Giesen to Oschatz | 151.25 mi (243.41 km) |
