| Trondheim to Oberkirch | 1,032.94 mi (1,662.36 km) |
| Trondheim to Obernburg am Main | 940.12 mi (1,512.97 km) |
| Trondheim to Obernkirchen | 772.69 mi (1,243.53 km) |
| Trondheim to Oberschleissheim | 1,049.76 mi (1,689.42 km) |
| Trondheim to Oberstdorf | 1,106.88 mi (1,781.36 km) |
| Trondheim to Obertraubling | 1,001.59 mi (1,611.90 km) |
| Trondheim to Obertshausen | 925.11 mi (1,488.83 km) |
| Trondheim to Oberursel | 916.34 mi (1,474.71 km) |
| Trondheim to Ochsenfurt | 952.16 mi (1,532.36 km) |
| Trondheim to Ochsenhausen | 1,061.24 mi (1,707.89 km) |
| Trondheim to Ochtrup | 784.17 mi (1,262.00 km) |
| Trondheim to Odenthal | 864.95 mi (1,392.00 km) |
| Trondheim to Oelde | 805.39 mi (1,296.16 km) |
| Trondheim to Oelsnitz | 901.51 mi (1,450.84 km) |
| Trondheim to Oer-Erkenschwick | 822.49 mi (1,323.66 km) |
