| Gembloux to Oignies | 74.54 mi (119.95 km) |
| Gembloux to Oissel | 180.69 mi (290.79 km) |
| Gembloux to Olivet | 225.01 mi (362.12 km) |
| Gembloux to Ollioules | 516.10 mi (830.58 km) |
| Gembloux to Olonne-sur-Mer | 405.61 mi (652.76 km) |
| Gembloux to Oloron-Sainte-Marie | 567.00 mi (912.50 km) |
| Gembloux to Onet Village | 439.38 mi (707.12 km) |
| Gembloux to Onnaing | 49.29 mi (79.33 km) |
| Gembloux to Orange | 444.20 mi (714.87 km) |
| Gembloux to Orchies | 63.54 mi (102.25 km) |
| Gembloux to Orleans | 222.56 mi (358.18 km) |
| Gembloux to Orly | 162.34 mi (261.26 km) |
| Gembloux to Ormesson-sur-Marne | 155.99 mi (251.05 km) |
| Gembloux to Orsay | 170.69 mi (274.71 km) |
| Gembloux to Orthez | 552.07 mi (888.48 km) |
