| Olesa de Montserrat to Noventa Vicentina | 547.89 mi (881.75 km) |
| Olesa de Montserrat to Novi di Modena | 508.69 mi (818.66 km) |
| Olesa de Montserrat to Novi Ligure | 412.06 mi (663.15 km) |
| Olesa de Montserrat to Nuoro | 397.34 mi (639.45 km) |
| Olesa de Montserrat to Occhiobello | 540.09 mi (869.18 km) |
| Olesa de Montserrat to Oderzo | 604.50 mi (972.85 km) |
| Olesa de Montserrat to Oggiono | 473.59 mi (762.17 km) |
| Olesa de Montserrat to Olbia | 397.45 mi (639.63 km) |
| Olesa de Montserrat to Oleggio | 438.24 mi (705.28 km) |
| Olesa de Montserrat to Olgiate Comasco | 458.72 mi (738.23 km) |
| Olesa de Montserrat to Olgiate Olona | 449.28 mi (723.05 km) |
| Olesa de Montserrat to Omegna | 441.79 mi (710.99 km) |
| Olesa de Montserrat to Opera | 452.65 mi (728.47 km) |
| Olesa de Montserrat to Oppeano | 533.00 mi (857.78 km) |
| Olesa de Montserrat to Orbassano | 371.04 mi (597.13 km) |
