| Country: | JPN |
| Type: | National |
| Route: | 355 |
| Map Custom: | yes |
| Length Km: | 73.8 |
| Length Ref: | [1] |
| Established: | 1 April 1975 |
| Direction A: | North |
| Terminus A: | in Kasama, Ibaraki |
| Direction B: | South |
| Terminus B: | in Katori, Chiba |
| Previous Type: | Route |
| Previous Route: | 354 |
| Next Type: | Route |
| Next Route: | 356 |
National Route 355 is a national highway of Japan connecting Katori, Chiba and Kasama, Ibaraki in Japan, with a total length of 73.8 km (45.86 mi).