| Dublin to Oerlinghausen | 631.64 mi (1,016.53 km) |
| Dublin to Oestrich-Winkel | 651.99 mi (1,049.28 km) |
| Dublin to Offenburg | 702.69 mi (1,130.87 km) |
| Dublin to Oftersheim | 695.31 mi (1,118.99 km) |
| Dublin to Ohrdruf | 740.22 mi (1,191.27 km) |
| Dublin to Ohringen | 737.12 mi (1,186.28 km) |
| Dublin to Olbernhau | 850.78 mi (1,369.20 km) |
| Dublin to Olching | 843.47 mi (1,357.44 km) |
| Dublin to Oldenburg | 597.55 mi (961.67 km) |
| Dublin to Oldenburg in Holstein | 700.49 mi (1,127.32 km) |
| Dublin to Olfen | 583.48 mi (939.01 km) |
| Dublin to Olpe | 617.29 mi (993.44 km) |
| Dublin to Olsberg | 636.17 mi (1,023.82 km) |
| Dublin to Oranienburg | 808.26 mi (1,300.77 km) |
| Dublin to Ortenberg | 684.03 mi (1,100.84 km) |
