| Gabrovo to Oestrich-Winkel | 957.94 mi (1,541.66 km) |
| Gabrovo to Offenburg | 922.20 mi (1,484.14 km) |
| Gabrovo to Oftersheim | 916.55 mi (1,475.04 km) |
| Gabrovo to Ohrdruf | 879.70 mi (1,415.74 km) |
| Gabrovo to Ohringen | 874.02 mi (1,406.60 km) |
| Gabrovo to Olbernhau | 781.13 mi (1,257.11 km) |
| Gabrovo to Olching | 770.37 mi (1,239.79 km) |
| Gabrovo to Oldenburg | 1,058.32 mi (1,703.20 km) |
| Gabrovo to Oldenburg in Holstein | 1,025.63 mi (1,650.60 km) |
| Gabrovo to Olfen | 1,035.39 mi (1,666.30 km) |
| Gabrovo to Olpe | 995.32 mi (1,601.81 km) |
| Gabrovo to Olsberg | 981.77 mi (1,580.00 km) |
| Gabrovo to Oranienburg | 881.76 mi (1,419.05 km) |
| Gabrovo to Ortenberg | 926.74 mi (1,491.44 km) |
| Gabrovo to Oschatz | 816.74 mi (1,314.42 km) |
