| Country: | JPN |
| Type: | National |
| Route: | 205 |
| Map Custom: | yes |
| Length Km: | 23.2 |
| Length Round: | 1 |
| Length Ref: | [1] |
| Established: | 18 May 1953 |
| Direction A: | West |
| Terminus A: | in Sasebo |
| Junction: | |
| Direction B: | East |
| Terminus B: | in Higashisonogi |
| Previous Type: | Route |
| Previous Route: | 204 |
| Next Type: | Route |
| Next Route: | 206 |
National Route 205 is a national highway of Japan connecting Sasebo and Higashisonogi in Japan, with a total length of 23.2 km (14.42 mi).