| Country: | JPN |
| Type: | National |
| Route: | 408 |
| Map Custom: | yes |
| Length Km: | 116.9 |
| Length Ref: | [1] |
| Established: | 1 April 1982 |
| Direction A: | North |
| Terminus A: | in Takanezawa, Tochigi |
| Direction B: | South |
| Terminus B: | in Narita, Chiba |
| Previous Type: | Route |
| Previous Route: | 407 |
| Next Type: | Route |
| Next Route: | 409 |
National Route 408 is a national highway of Japan connecting the cities of Narita, Chiba and Takanezawa, Tochigi, with a total length of 116.9 km (72.64 mi).