| Country: | NOR |
| Type: | Fylkesvei |
| Route: | 406 |
| Map Custom: | yes |
| Length Km: | 18.1 |
| Direction A: | North |
| Terminus A: | at Stemloma |
| Direction B: | South |
| Terminus B: | at Sennumstad |
| Previous Type: | fylkesvei |
| Previous Route: | 405 |
| Next Type: | fylkesvei |
| Next Route: | 407 |
Norwegian County Road 406 (Fv 406) is a Norwegian county road in Birkenes municipality in Agder county, Norway. The 18.1km (11.2miles) long road runs between the village of Sennumstad on the Tovdalselva river to the village of Stemlona.[1] The road connects to the Norwegian County Road 405 at Stemlona and it connects to the Norwegian National Road 41 at its other end at Sennumstad. The road runs through a fairly rural area in Birkenes. The Sørlandsbanen railway line crosses over the road at Fidje.