| Dublin to Octeville | 324.87 mi (522.83 km) |
| Dublin to Oignies | 441.36 mi (710.30 km) |
| Dublin to Oissel | 420.76 mi (677.15 km) |
| Dublin to Olivet | 520.65 mi (837.90 km) |
| Dublin to Ollioules | 896.38 mi (1,442.58 km) |
| Dublin to Olonne-sur-Mer | 511.08 mi (822.51 km) |
| Dublin to Oloron-Sainte-Marie | 747.73 mi (1,203.36 km) |
| Dublin to Onet Village | 738.59 mi (1,188.65 km) |
| Dublin to Onnaing | 467.20 mi (751.89 km) |
| Dublin to Orange | 810.15 mi (1,303.81 km) |
| Dublin to Orchies | 450.70 mi (725.34 km) |
| Dublin to Orleans | 518.87 mi (835.04 km) |
| Dublin to Orly | 491.91 mi (791.65 km) |
| Dublin to Ormesson-sur-Marne | 494.75 mi (796.23 km) |
| Dublin to Orsay | 487.38 mi (784.36 km) |
