| Oker–Bad Harzburg railway | |
| Routenumber: | 320, 354 |
| Linenumber: | 6425 |
| Linelength Km: | 6.9 |
| Tracks: | 1: Oker–Bad Harzburg |
| Locale: | Lower Saxony, Germany |
The Oker–Bad Harzburg railway is a branch line between Oker and Bad Harzburg on the northern edge of the Harz mountains in Germany. It was opened on May 1, 1912.
The 6.9 kilometre long route is single-tracked between Oker and Bad Harzburg.
The line is worked by regional trains on the Kreiensen–Seesen–Goslar–Bad Harzburg and Hanover–Hildesheim–Goslar–Bad Harzburg route.