| Gebze to Orbetello | 946.08 mi (1,522.57 km) |
| Gebze to Oria | 618.45 mi (995.30 km) |
| Gebze to Oristano | 1,096.55 mi (1,764.73 km) |
| Gebze to Orta Nova | 715.02 mi (1,150.71 km) |
| Gebze to Orte | 886.29 mi (1,426.35 km) |
| Gebze to Ortona | 783.33 mi (1,260.65 km) |
| Gebze to Orvieto | 900.98 mi (1,449.98 km) |
| Gebze to Orzinuovi | 1,030.79 mi (1,658.90 km) |
| Gebze to Osimo | 836.50 mi (1,346.22 km) |
| Gebze to Ospitaletto | 1,026.27 mi (1,651.62 km) |
| Gebze to Ostuni | 619.65 mi (997.23 km) |
| Gebze to Ottaviano | 781.00 mi (1,256.90 km) |
| Gebze to Ovada | 1,084.73 mi (1,745.70 km) |
| Gebze to Ozieri | 1,067.96 mi (1,718.72 km) |
| Gebze to Paceco | 920.73 mi (1,481.77 km) |
