| Country: | NAM |
| Type: | B |
| Route: | 4 |
| Maint: | Roads Authority Namibia |
| Map: | Map NAM B4.svg |
| Map Notes: | Map of the B4. |
| Length Km: | 334 |
| Direction A: | East |
| Direction B: | West |
| Terminus A: | near Keetmanshoop |
| Terminus B: | Lüderitz |
| Cities: | Keetmanshoop, Aus, Lüderitz |
| Towns: | Seeheim, Goageb, Garub, Kolmanskop |
| Previous Type: | B |
| Previous Route: | 3 |
| Next Type: | B |
| Next Route: | 6 |
B4 is a national highway of Namibia. It passes through the ǁKaras Region of Namibia in the south-west in a west–east direction for 334km (208miles), connecting Lüderitz on the coast to Keetmanshoop.
The B4 crosses the Sperrgebiet, an area restricted for diamond mining along the coast of the Atlantic, between Aus and Lüderitz. Travellers may leave the road only at demarcated places. It also forms the southern border of the Namib-Naukluft National Park.[1]