| Country: | JPN |
| Type: | National |
| Route: | 209 |
| Map Custom: | yes |
| Length Km: | 35.5 |
| Length Ref: | [1] |
| Established: | 18 May 1953 |
| Direction A: | North |
| Terminus A: | in Kurume |
| Direction B: | South |
| Terminus B: | in Ōmuta |
| Previous Type: | Route |
| Previous Route: | 208 |
| Next Type: | Route |
| Next Route: | 210 |
National Route 209 is a national highway of Japan connecting Ōmuta and Kurume in Japan, with a total length of 35.5 km (22.06 mi).