| Country: | TZA |
| Type: | T |
| Route: | 4 |
| Maint: | TANROADS |
| Map: | T4 Tansania.svg |
| Map Notes: | The T4 is indicated in red. |
| Length Km: | 765 |
| Direction A: | West |
| Terminus A: | at the Kenyan border at Tarime |
| Junction: | in Makutano in Lamadi in Kisesa in Usagara in Biharamulo in Kyaka |
| Direction B: | East |
| Terminus B: | Ugandan border at Mutukula |
| Regions: | Mara, Simiyu, Mwanza, Geita, Kagera |
| Cities: | Tarime, Mwanza, Sengerema, Geita, Bukoba, Mutukula |
| Previous Type: | T |
| Previous Route: | 3 |
| Next Type: | T |
| Next Route: | 5 |
The T4 is a Trunk road in Tanzania. The road runs along Lake Victoria in the regions of the Lake Zone in Tanzania. The T4 runs from Tarime at the Kenyan border all the way through Mwanza and Bukoba to the Uganda
Between Kigongo and Busisi, the trunk road traverses over the Mwanza gulf. As part of the trunk road there are several scheduled ferries between the two cities. There are about 1,600 vehicles crossing the channel by ferry per day, spending 35 minutes per crossing. Currently under construction is the Kigongo–Busisi Bridge (Magufuli Bridge), once complete will connect both sides by road and expand the weight limit of this part of the route.[3]