| Country: | NAM |
| Type: | B |
| Route: | 3 |
| Maint: | Roads Authority Namibia |
| Map: | Map NAM B3.svg |
| Map Notes: | Map of the B3. |
| Length Km: | 179 |
| Direction A: | East |
| Direction B: | West |
| Terminus A: | at the South African border at Nakop |
| Terminus B: | at Grünau |
| Towns: | Ariamsvlei, Karasburg |
| Previous Type: | B |
| Previous Route: | 2 |
| Next Type: | B |
| Next Route: | 4 |
B3 is a national highway of Namibia. It passes through the ǁKaras Region of Namibia in the south for 179km (111miles), connecting the B1 at Grünau to the South African border at Nakop via the town of Karasburg. In South Africa the highway continues as the N10 towards Upington.[1]