| Grimbergen to Oestrich-Winkel | 171.61 mi (276.18 km) |
| Grimbergen to Offenburg | 232.78 mi (374.63 km) |
| Grimbergen to Oftersheim | 215.02 mi (346.05 km) |
| Grimbergen to Ohrdruf | 276.81 mi (445.48 km) |
| Grimbergen to Ohringen | 256.51 mi (412.82 km) |
| Grimbergen to Olbernhau | 391.03 mi (629.30 km) |
| Grimbergen to Olching | 363.37 mi (584.78 km) |
| Grimbergen to Oldenburg | 223.18 mi (359.17 km) |
| Grimbergen to Oldenburg in Holstein | 358.16 mi (576.40 km) |
| Grimbergen to Olfen | 140.37 mi (225.90 km) |
| Grimbergen to Olpe | 150.19 mi (241.71 km) |
| Grimbergen to Olsberg | 180.02 mi (289.72 km) |
| Grimbergen to Oranienburg | 398.01 mi (640.54 km) |
| Grimbergen to Ortenberg | 208.51 mi (335.57 km) |
| Grimbergen to Oschatz | 379.00 mi (609.94 km) |
