| Country: | JPN |
| Type: | National |
| Route: | 255 |
| Map Custom: | yes |
| Length Km: | 20.3 |
| Length Round: | 1 |
| Length Ref: | [1] |
| Direction A: | North |
| Terminus A: | in Hadano, Kanagawa |
| Junction: | |
| Direction B: | South |
| Terminus B: | in Odawara, Kanagawa |
| Previous Type: | Route |
| Previous Route: | 254 |
| Next Type: | Route |
| Next Route: | 256 |
National Route 255 is a national highway of Japan connecting Hadano, Kanagawa and Odawara, Kanagawa in Japan, with a total length of 20.3 km (12.61 mi).